Horrific Service from MTN SA after upgrade

I did an upgrade in June 2019 and have had endless issues since then. From the onset I was being charged double on my account. I then stopped paying my debit order until MTN sorted the issue out. The issue has still not been resolved. I have been on the phone with about 20 different people all giving me the run around. You never get feedback and you keep getting smss to say how much you owe. My account has been suspended although nobody has called me to discuss