The worst customer experience

I cancelled my contract with MTN on 17/09/20 and paid a cancellation fee because my contract was only ending in October 20.I received a message on 22/09/20 confirming that my account was cancelled . I then called retentions dept a few days later just to check if indeed the cancellation was done. I found that it was not done. Since then I have been calling them every week and I was promised that their mistake will be rectified.

After one of the calls I made I received a reference number and a billing. I then called back immediately and I was told that it was a mistake and that they will rectify it.

End of October a premium was deducted from my bank account . I have been calling since then . Every time I call I am being promised that money will be credited to my bank account.

As I am typing I have been on hold for 48 minutes now and counting. I am so disappointed and angry with the retentions dept.

Mtn is still sending me messages to upgrade yet they can't solve a minor problem. All these times I have been complaining I am being told that they will get back to me . What kind of service is this?

Again these calls that I have been making takes me more than 40 minutes on the line, that is my precious time and they are not even sorry about it.

I cannot take this anymore.