"Car Parking over charge"

I visited my father in hospital in March and paid for parking.

I returned 4 days later just after 3pm and left just after 5.30pm and so was expecting to be charged the same amount as before. However, when I went to pay I was asked to pay over £100! The system must have thought I hadn't left after the first visit and that I'd been in the car park since then!

There was no help available and nothing happened when I pressed the 'help' button on the screen so I had no alternative but to pay the amount.

When I then got to the barrier the sign said I hadn't paid and refused my exit!

I pressed the help button on the post by the exit barrier and eventually got someone to help open the barrier, although they were shocked I had actually paid the money. But as I explained, there was no such button/help available at the machines in the hospital.

I subsequently attached confirmation of money paid on the first visit and photo of receipt for the second visit as requested, but have not had a single reply from numerous phone calls and emails.

Happy to pay the usual parking charge for the day's visit but am still seeking reimbursement for rest.