Paid 3 times for one meal due to useless app unable to handle payment method

I tried do an online order with Ocean Basket and used the MasterPass Scan to Pay option for an amount of R 304 and tried twice and order was still reflecting as unpaid, yet I have 2 receipts confirming payment was successful. I then did another payment using the actual card details and it went through.It looks like the app is incomplete with for example he the help section displaying the "Lorum ipsum" default placeholder. Clearly this app was not properly tested and you are taking peoples money from it ! I called the Customer care number on the website +27 (0) 61 *** and the call was immedaitely dropped. They need to refund me 2 x R 304 or I need contact my bank next week and ask for a ***** reversal. They should make sure the app works before releasing it and they should have some sort of customer service email or feedback form in app or website !