Worst customer service of any company

I have never in my life dealt with a company who has worse customer service than MTN. I have been trying to close my account since April this year, & I am still unable to do so. Since April this year I have repeatedly called and requested for my account to be closed. No-one can ever help me and keep telling me they will forward my request to the retentions department who are the most useless department of any company in existence. In all this time, the retentions department have only twice been able to tell me what I should pay to cancel the contract. However both times there are extremely high unbilled and current amount owing on the account, which are far higher than my monthly debit order. This surpises me as I ahve neevr missed a debit order. These charges are over and above the early termination fee I have to pay on the handset due to me terminating my contract early. I understand what the early termination fee is, but these additional unbilled and current amount owing are very high, and no-one can explain these to me. You staff are not trained to do their jobs!<br> I am disgusted by this service, how long it takes to get any response and by the overall incompetence of your staff