Overbilling on Data

Ok MTN whats up with your utterly **** service?? We have been subscribed to yourselves for 3 years now and lo and behold, third year in a row you send us a bill for data thats sky high. As with the two years before, same time of year, we disputed the account less than 3 weeks ago, and in so doing paid our normal bill ( which we get 11 months of the year). July- August account being the annual stuff up. 2013 you billed 12 x monthly subscription, 2014 8 x times the monthly subscription and this year 5 x the monthly subscription. Now after talking to your inefficient call centre agent, we were assured our lines would not be cut while this account is under query and hey as predictable as your service is we were cut two days ago. Attempts at getting through to your customer service department a total waste of time since your very efficient answering service answers with \ the number you entered is not a valid mtn contract number"right 4 different cell numbers??? Your service options also donot even offer a human being option at all..not that even speaking to one would make a difference!! Now in 2013 you got an extra 8k for your stuff up in 2014 an extra 6k for your stuff up. """