One Cart payment taken from my account, but not reflecting on one carts side.

I tried to place an order on Sunday 11th July 2021 through the app. Added everything to my cart and used the payfast method to do the payment and wanted to use the R14 credit i had in my account on one cart. Everything was successful from my bank and the money was deducted from my account instantly, but when i was routed back to the one cart app it said payment failed.

I contacted OneCart and they said they cannot see the payment on their side and will be reversed, and advised me to contact my bank, which I did. My bank have confirmed the money was definitely taken off of my account, and not in a reversal state. The amount was for R442,00, and the bank now wants to charge me R320 for the amount to be reversed, so i ultimately would lose R320 in this instance.

So i again contacted one cart, and they are still claiming the money is not reflecting on their side. So i am a bit lost on what to do next, i dont have time to bounce around between calling OneCcart and the bank, where no one can give me a concrete answer here.