sacamming double payment

On Saturday night I checked into the airport parking lot at 18.29 , at 18:53pm I made a payment of R30 via the pay station . At 18:57 I was at the exit point and the ticket read as unpaid the attendant assisted and tried over so many times , it still was not reading, I showed him the sms as well as my banking app with the money out, after 10 min, he advised that it could be an arrears and the money will reverse in 24 hours and i should make another payment,I had to turn the car around and go back to the pay station to make another payment as the pay station at the exit point was not working, When i went to make another payment the price increased to R55 from R30, which was not my fault because they held me up for over 20 min after i initially made a payment of R30 and showed the proof. Ive been emailing back and forth, But as dumb as they are and unable to understand simple maths, they are not assisting me, even after sending bank statement, proof of text and parking ticket.. this was the last email sent to them...... ---------------- "We seem to be going around in circles here, I sent u a copy of my bank statement which shows u the R30 + R55 going off my account, If you having this much difficulty understanding simple grade1 Maths, Then i will have this escalated higher , where i will request for camera footage as well, cause all i am asking for is my R55 plus my back charges for the payment made.. My parking time was "UNDER 30 MINUTES '' , your attendant held me up because your pay station had an error and did not reflect my payment after me providing proof of payment via sms and baking app."

A refund of R55 + plus bank charges needs to be reversed back into my account as it was not my fault..

Kind Regards