Hate MTN

Cannot believe the incompetence of MTN, I mean I upgraded and called the call centre to add on a 3gb ONCE OFF and was found three months later that the consultant had added it as a recurring bundle, now I am spending more than I was expected to and disgusted as I have been a client with mtn for years and this the thanks that i get, if you need to get hold of me you would need to call me on my prepaid number *** as you have suspended my account and I paid R1200 as well, please advise on the credit to my account.