Takealot app *****ing voucher - Support useless!!

I placed an order using a Vodacom voucher (R400) I received. I did make the payment for the outstanding amount using my credit card. Later I received an email saying I did not make the payment. However, when I select the pay now option I get a screen that mentions "You don't owe us a cent. Your coupon covers the full value of your order." However, the next day my order was canceled as it says I did not make the payment. Now I cannot use my voucher anymore as it is showing that I have already used my voucher but this is not true as my order was canceled.

I tried contacting support however they just keep on telling me that my payment is not showing on their side. This is very frustrating because I have explained it in several different ways adding screenshots and proof, but still, I get the same response. So now I have lost R400 for trying to buy something and the app failing to accept/detect my payment.