This week, we explain how unscrupulous fraudsters try to catch out those already taken in by promising to help them recoup their losses.
How does it work?
So-called "fraud recovery fraud" takes place when fraudsters contact those who have already lost money claiming to be law enforcement officers or lawyers who can recoup their losses.
In the latest "fraud recovery fraud" scam, criminals are sending out letters that appear to be from the police to fraud victims, suggesting they can get their money back if they send their personal details to a South African bank.
The fraudsters use National Fraud Intelligence Bureau branding and the name of a real police commissioner to convince people the letters are genuine.
But their aim is simply to gather more information about the victims so they can scam them again.
Detective Chief Inspector Andy Fyfe, of the City of London Police, said: "This fraudulent letter is clearly not something that the National Fraud Intelligence Bureau would send to the public.
"It takes advantage of people's trust in order to steal money from those who have already fallen victim."
How can I avoid being caught out?
The police believe it is likely that the letters are being sent out randomly, so you may receive a letter of this kind whether you have been taken in by a fraud or not.
Either way, the best course of action is simply to ignore and bin it.
Even if the offer seems genuine and official, you should take advice from Action Fraud on 0300 123 2040 before responding.
I've been defrauded. What should I do?
You can report fraud recovery fraud to Action Fraud on the number above.
If you have shared any personal details that could be used to compromise your bank or credit accounts with the fraudsters, you should also contact the account providers as quickly as possible to ensure you are protected against any attempts to steal your money.
Look out too for signs your identity may have been stolen. These include bills arriving at your home addressed to someone else, and your credit report including an account you never opened.
Victims of scams and fraud
Victims of scams and fraud
Susan Tollefsen, Britain's oldest first time mother, was scammed out of £160,000 by a fraudster she met on an online dating site. A man claiming to be an Italian gold and diamond dealer told her he was in the middle of a land deal but couldn't access cash. Tollefsen felt sorry for him and started wiring him money, eventually selling her jewellery, her flat and borrowing £32,000 from friends to give him. Read the full story here.
In March 2015 an American woman who was only identified as 'Sarah' went on the popular US television programme the Dr Phil Show to reveal she had sent $1.4 million to a man that she had never met. Although she was certain she wasn't being scammed, her cousin made her go on the programme because she was convinced it was a scam. Find out more about the story here.
Maggie Surridge employed Lee Slocombe to lay a £350 deck in her garden in March 2015. However Slocombe used a combination of lies to scam Surridge out of thousands of pounds. He told Surridge that the front and back walls were dangerous and needed rebuilding and also conned her into building a porch, all for the cost of £8,500. Read the full story here.
It's not just individuals who can be the victims of scams, big corporations can also fall foul of these fraudulent practices. In 2015 Claire Dunleavy repeatedly used a 7p 'reduced' sticker to get significant amounts of money off her shopping at an Asda store in Burslem, ending up with her paying just £15.66 for a shop that should have cost £69.02. Read the full story here.
Sylvia Kneller, 76, was conned out of £200,000 over the space of 56 years thanks to scam mail. The pensioner became addicted to responding to the fraudsters, convinced that she would one day win a fortune. Ms Kneller would receive letters claiming she had won large sums of money but she needed to send processing fees to claim her prize. Learn about the full story here.
Leslie Jubb, 103, became Britain's oldest scam victim in August last year when he was conned out of £60,000 after being sent an endless stream of catalogues promising prizes in return for purchasing overpriced goods. The extent of this con was discovered when Mr Jubb temporarily moved into a care home and his family discovered what he had lost. Find out more about this story here.
Stephen Cox won more than £100,000 on the National Lottery in 2003 but has been left with nothing after falling victim to two conmen. The 63-year-old was pressured into handing over £60,000 to the men who told him his roof needed fixing. They walked him into banks and building societies persuading him to part with £80,000 of cash while doing no work in return. See the full story here.
Last year the Metropolitan Police released CCTV footage of a woman who had £250 stolen at a cash machine in Dagenham. The scam involved two men distracting the woman at the machine, pressing the button for £250 then taking the money and running away. Read about the full story here.
Rebecca Ferguson shot to fame as a runner up on the X-Factor in 2010 but fell victim to a scam artist last year when someone she had believed to be a friend conned her out of £43,000. Rachel Taylor befriended the singer in 2012 and claimed to be a qualified accountant, so Ferguson allowed her to look after her finances. Instead of doing this Taylor stole £43,000 from the Liverpudlian singer. Read more here.
When Rebecca Lewis discovered her fiance had started a relationship with a woman he met online she packed her bags to leave. But that didn't stop her checking out the mystery woman, Rebecca quickly realised Paul Rusher's new love was actually part of a romance scam. She told Paul just before he sent the scammers £2,000 which was supposed to bring his new girlfriend to England. Find the full story here.