MTN disgusting service

I upgraded my phone contact at MTN on the 7th of January. Somehow I misplaced my old SIM card. I have been back and forth to the MTN store 4 time only to be told each time to wait 2-24 hours. I’ve had this complaint ‘escalated to the head office’ and was also told by the operator that it will be working within 3 days. 5 days later my sim has still not been activated!!! This is disgusting service and within my right to cancel the contact and return the phone to the store!!!