MTN Accounts on two platforms do not communicate

Since MTN's app came out I started paying on the App. These payments, however, does not reflect on my account as it has a new account number - of which I was not informed. I called several times and every time they tell me to send proof of payment - which I did not keep or get from the app. Is there not a way that MTN can sync their payments? Now I am threatened of losing my service... Come on MTN - keep up with the technology.