MTN SERVICE UNACCEPTABLE

I am a client of MTN for many years. My bill is being paid by debitorder. This morning I received the following sms:' Y'ello! MTN hasn't received your payment. To stay connected, please pay R 2275.66, in-store or via your bank, using billing profile BA*** as a reference. You can find the banking details on your invoice.' I looked on the invoice, there was no banking details. I phoned an MTN shop to get the banking details. I tried to add MTN as beneficiary on my banking app, however it rejected the above mentioned reference. I tried to phone 083135, got through to ' 'MTN Champion'; she could not help and promised to put me through to another agent. I held on for 12 minutes, nobody picked up. I phoned again, same story the "Champion' could not help me. I am holding on for 13 minutes now, without anybody picking up, only music playing! Mu bussiness is dependant on my cell phone contract. I am stuck!!!