Data billing

Data over charging and billing every weekend. I called customer line 173 to get clarity as I had problems with MTN.I called my son on his cellphone five times and I kept getting the message that my airtime is exhausted I must load airtime. None of the calls mentioned were successful. I then spoke to Khensane who said I must reboot my device of which I did but the problem persisted. I then checked my airtime which was R35.00 and went to R29.00 wheras my data were 204 and was 46. I called again spoke to Noluthando. I tried to explain but these gentlemen hanged my phone. The data bundles were then 39 without internet connection. I called again and spoke to a lady who put me through to another person whom never spoke to me I have been hanging for almost 20 minutes until my battery died and no one came back to me to explain as to why MTN is taking away our data bundles without internet running. We complain on daily basis on tweeter but no one from MTN comes forward to explain why they are ripping our pockets by taking data bundles and airtime. Every weekend is the same problem of taking away airtime and data bundles and their so called MTN champion is so useless like their network