Former chairman of Kirklees Magistrates' Court, Eileen Marchant, spent 28 years listening to excuses on the Huddersfield magistrates' bench.
So she was more than experienced when the company that manages her local Lidl car park tried to take her on.
The shopper - who had actually visited the store twice that day - was even more determined when her appeal was rejected.
Eileen was slapped with a ticket by Athena Parking, which claimed she had overstayed the limit at the Aspley store.
Lidl has not commented on the incident
But Eileen appealed as she knew she had not breached the rules, The Examiner reports.
She had visited twice in one day, both for short periods, returning the second time after forgetting to buy cat food.
Eileen appealed as she was sure evidence from the cameras would see her in the clear.
A veteran of complicated court trials, she compiled the evidence that would provide her alibi.
The fine could have increased if not paid immediately (stock photo)
She posted the parking firm a receipt and a witness statement from the coffee shop she was in when they said she was parked at Lidl.
But she was outraged when her appeal was turned down.
The firm sent her a letter saying they had reviewed the photographic evidence, but she did not believe they had.
Eileen refused to take the set-back lying down.
"I knew I had left the car park in time," said Eileen.
Eileen Marchant was formerly chairman of Kirklees Magistrates' Court
"They obviously hadn't bothered to check it out properly – they just turned down my appeal.
"I was most upset with their very aggressive, bully boy tactics.
"Their letter said I had failed to comply and had to pay or enforcement action would be instigated against me."
She added: "It said the appeals process had been exhausted and there was no further discussion on the matter.
"It said I could appeal to the Independent Appeals Service but ended with a thinly veiled threat saying I should think carefully and then written in bold that if my appeal was rejected I would have to pay the full charge.
"Someone who was more easily intimidated than me would just pay it, even if they knew they'd done nothing wrong."
The fine could have increased to £90 if the matter kept dragging on.
Eileen was about to take action but before she could her ticket was suddenly cancelled.
But she has received no apology.
She has now written a strongly worded letter to the Portsmouth-based parking firm and advised others to make sure they fight their corner.
Refusing to pay a penalty charge notice received at a private car park does not land you in criminal court.
Parking firms would have to take any non-payer to civil court.
Very few do so due to the time and cost involved.
A spokesman for Athena said a mix-up caused by two staff dealing with Eileen's appeal meant it was originally rejected before being successful.
They added: "We have checked our systems and have found no evidence of any error but we have cancelled this charge in any event, on receipt of Eileen Marchant's email."
Refusing to pay Kirklees Council penalty charges is a different matter, which can lead to a criminal court summons.
Lidl did not respond to a request for a comment.