Sim not provisioned for 3 weeks now after contract upgrade. No one at MTN can help me!!

Please help me MTN. I did an upgrade on my contract, and since the day they delivered the phone 3 weeks ago, my sim has not been provisioned. I can not do banking or make payments, this is a real problem. Not a single person has been able to assist me. I have been to two different MTN branches (Whom has called many different people and logged tickets) but to no avail. I have called every MTN number available on the internet, and spoken to many different MTN call center staff, but no one can help me. They always transfer me to someone else, but 90% of the time the call just gets cut off. I have logged a complaint on "***" but nothing is happening. This is literally the last option I have, so I am hoping that someone at MTN will take enough care and try assist me.