OVERCHARGING FOR I MB DATA NUMEROUS TIMES

I have been overcharged for 1MB eight times and even charged for 10MB data which I never ever purchase in the month of October. I spoke to a supervisor Ayesha Jaffer who promised to listen to the recordings whre I supposedly ordered all this data and revert to me on Friday, the 13/11/2015. She then called me back on Friday and said that there was a system error and would only be able to call me back on Monday. I did not receive a call back from her on Monday, the 16/11/2015. Today the 17/11/2015 I called twice already and was told that she would call me back in 5 minutes and after waiting a half hour I called again to be told that she is now on lunch. I also find that because I have two numbers on my contract, when i call to purchase data for one number, the consultants incorrectly add the data to the number which i am calling from. Please check your bills properly.