Unhappy with service received

On Saturday the 10th I went to the McDonald's in parktown at and was at the drive through where I adv the agent that I don't have my card and asked her if can I do a scan to pay and was advised that I can and so I proceeded to pay.

Only to be told that I can't get a receipt or the food I paid for and was told that my money would reflect in my account with in 24hrs which has passed and still nothing or a response from McDonald's after I laid a complaint and only got a response today with a case ***-8A88F1

How is it that they can take payment with scan to pay but can't allow me to get the goods I paid for and still havent been refunded for something that wasn't my fault. I waisted my time and money and petrol for nothing.

I included the transaction purchase below and still my money hasn't been paid back

Capitec: Payment -R50.90 from SAVINGS ACCOUNT; Ref FNB QR*McDonald's Park Park ZA; 10-Sep. Info ***

Please help