Wimpy cellphone App and service

Had breakfast at Wimpy Mayville Mall yesterday morning. Downloaded the Wimpy app to do the payment. Scanned the QR code and the payment went through. The manager insisted that he needed proof of payment on his system. He entered the PIN for the transaction and it was processed again. Even though I showed him proof of the double payment he refused to acknowledge and said I had to bring my bank statement to show him proof of the double payment. Wimpy's customer care line is out of service and my web enquiry is still not answered. The not my problem attitude from the manager made me furious. I deleted the App from my phone and will not be paying for anything with a QR code again. I will now have to complete forms and dispute the transaction with my bank. Bad Wimpy, bad cellphone App, bad service.