Business ProfileforAM Airport Parking

I reserved a parking space initially from May **** and was charged the downpayment of $17.53 with balance of ***** due upon arrival, confirmation no. OG127359226. The next day I updated my reservation to returning May 13.Upon arriving prior to my flight May 2, there were no attendants but a sign posted just outside of the gate had a QR code and said to pay there, which I did. In the course of having some glitches with the code, it not only charged me again for the downpayment, but had me returning on May 14, which means I was charged an erroneous total of $112.45. It wasn't until the shuttle driver arrived and asked me for my credit card that I learned I wasn't supposed to pay by QR code. He wasn't authorized to credit my account and because I was leaving the country, I told him I would resolve issue upon return.Since my return May 13, I have tried repeatedly by phone, email and e-form to get AM Parking to resolve this issue, with no response other than a single e-form response saying they would be in touch. The only time I was able to get a live agent, I was told the owners would be made aware of the issue and that I was sending a follow-up email. My complaints are:The signage at the entrance causes confusion to the consumer about where/how to pay, and the lack of response, let alone resolution. No one should have to chase a business to get a response, especially when that business is at fault. I'm requesting a refund for the $26.06 I am owed not just because of principle but because I'm a freelance journalist which means I'm low income. Regardless, the lack of accountability from this business is unacceptable.