POOR SERVICE AT MTN

MTN incorrectly charged my account by charging it double the amount, then proceeded to claim that my account is arrears. I have told the consultants on numerous occasions that I have proof of payment for each month since my contract began. However, I was told that the Credit department will not bother to contact me to solve this issue because my account is in arrears when in fact, it is not. Further I received a notification stating that "services will be stopped in 1 day". I am absolutely disappointed in MTN's level of service.