Professional Parking Invoice

I drove in and looked for parking, parked and paid for 4 hours. They sent an invoice saying I stayed 4 hours and 40 minutes, so I owe them $85.00.

I sent over a copy of my receipt disputing it and they say no I owe $85.00. Now I said I want to appeal and they are sending it to a 3rd party adjudicator (Effective Arbitration Inc).

No way I should be made to pay $85.00 for 40 minutes of parking.

Anyone go thru this process?