Suspect Billing and NO assistance

I have had a data contract with MTN since 2006. At the moment my account has a 9GB bundle, which we managed to use up in less than half the month and then still manage to run up a bill of over R4000.00.<br> It was very difficult for me to believe that we could run up such a large bill with a 9GB data bundle loaded.<br> <br> I complained to MTN on many occasions in 2012/2013. I at one stage received a credit from the billing department for over R7000.00. So clearly there was a problem? However the problem was never rectified. I still received large accounts and used up that lovely credit with in 2 months. When I contacted MTN again, they told me there was in fact never a problem and that the billing was correct!<br> <br> I asked the billing department to please try and help me to see where I was spending so much, which they could never really do. After leaving many messages for the billing dept. to contact me, they never did! The account came down for a few months but now has gone up again. I am now in the process of cancelling the account as it is just unaffordable and Telkom offers better rates. It would be great if you could get someone to look into this account for me!