: "My parents paid for an hour and we still have the ticket. They displayed the ticket clearly in the car.
"A week or so later a letter came through the post saying they had not entered the registration number correctly and they are seeking a stupid amount of money for their mistake.
"How would they even know if they made mistake entering it if the number is not displayed?"
He is now challenging the extortionate penalty on his father's behalf, armed with the original £1.50 ticket - without any registration on - and adamant about his parents' innocence.
The son insists that the couple drove into the car park at 14.09pm, bought a ticket and displayed it and then left at 14.41pm that afternoon.
He explained he had contacted Gladstone Solicitors, who represent Parallel Parking Ltd, the firm which runs the private car park, but to no avail.
It is so upsetting that people who do the right thing are being fined like this.
Kanti Lad "I have had conversations on the phone and emails to and from the solicitor of the firm," he continued. "It seems they don't want to know and want them to pay the astounding amount."
They claim the solicitors sent them a response saying that "no ticket was recorded against the full and exact vehicle registration number."
But the firm said Parallel Parking Ltd would be willing to accept a settlement fee of £140 "without prejudice", as a gesture of goodwill.
"It is so upsetting that people who do the right thing are being fined like this," a frustrated Mr Lad added.
Mr Lad still has his pay and display ticket proving he purchased one - but it does not print the registration number on it Credit: BPM The parking charge notice is now being challenged by his son - but the parking firm have so far refused to cancel the fine Credit: BPM