I need to make a payment to MTN, after speaking to their contact center they gave me the details:
MTN Contract Account Payments and so on.
From FNB, there are 6 MTN's listed including M-Tel, MTN Contract Payment ABSA and Standard Bank, they said Absa
so I tried all of the above except Mtel and standard bank, when I confirm it tells me that my reference(which is your cell number) is incorrect.