Unhappy customer

I recently settled my african banks loan and the reference is used on my POP in swapped the last 2 digits so African banks couldn't allocate the payment to my account. I have calmed and wash advised that I need to send the pop and my ID your them which I did twice and my payment has still not been allocated!!! I stead I get another Debi check for the account that was paid which I rejected!!! I paid all my accounts and I want paid up letters that's not available on the app. My account is also on R3000 credit which needs to be refunded to me! Can someone please assist that's actually capable of doing so.