Same thing happened to me at a Caucasian place. I paid using eftpos so had the time stamp on it. Drove off and came back to show them still within the 45mins I paid and they were trying to brush it off until I showed them the receipt. They kept saying they follow the timer etc and denied making an error. Then one of the senior receptionist took me aside and said she will make sure I get my time back next time. No point arguing with the first receptionist so I agree and left.