Pathetic service regarding payment allocation

I made payment to MTN using their mobile app (MyMTN) due to my debit order bouncing as I haven't moved all my debit orders.

Consequently their App sent me a proof of receipt for the payment and was subsequently reflecting on my bank account for the manual credit card payment.

I contacted customer care to allocate the payment to my account, attached the receipt from the app and subsequently informed that the payment isn't reflecting and that the payment is thus still outstanding.

I am fed up in dealing with *********** staff that cannot be bothered to investigate further.