mtn claims that i owe them money for 12GB of data between june and september

Mtn is claiming that I have used 12GB of data over a certain period of time. i frequently recieve messages (sometimes at odd hours of the night) saying that "you are depleting data ********** i have WIFI at my home as well as at my business area therefore there is no need to use MTN data. i have requested Mtn a number of times to kindly investigate the matter as well as send me a billing statement for the following four months namely June July August September. Mtn has not yet rep**** to my query. Mtn has also suspended my account on the basis of the first claim of R1005.00 which i paid due to threats of being blacklisted. They then charged me a second time an amount of R1642.80 and again they threaten to suspend my account without any transparency as to what is going on. i hereby kindly request you to investigate the matter as soon as possible. my details are as follows: Account Holders name: Yunus Kathrada Cell Number to be queried: ********** 466 Email address; **********