Poor service

I am very disappointed with the service from the MTN call center. I have been a contract customer with MTN for the last 10 years. Last week Friday my calls and data use were barred. I called the call center and none of the 4 consultants I spoke to could tell me why my line was suspended. My account is fully up to date. On Monday I called again, as they had promised my phone would be working, it was not. I was told by a consultant by the name of Luvuyo that my line was barred due internation sms roaming which it was put on. He said it had been assigned to someone to resolve. Today I phone in again and the 1st consultant Tiisetso tells me she can't help due to me answering the security questions incorrectly. I called the ***** line and answered the same security questions and they were correct. The ***** consultant told me the issue had been resolved and I must use the ussd code to clear, it did not work. She advised me to called customer services, I did and answered the very same security questions and they were correct. I was put through back to Tiisetso who then told me she would escalate the matter. Now I must wait to call back again in the morning. I 1