charged for data - but can't get proof

<p>Shocking service received from MTN. My account is always basically R199.00 per month, which is the contract amount. This month I received a bill for over R900.00. I requested details on numerous occasion from MTN, only to eventually be told that I have the device and I must check what I used the data on. I then asked someone to look at my pone for me and they also agree that I would seem that I did not use all the data being charged for. I very seldom used data, as I have wifi at home and only switch my data on once or twice a day just to check for message whattapp etc. They were absolutely adamant that they will not provide me with any info, and do not need to proof to me that I used this data. IN OTHER WORDS THAT CAN CHARGE WHAT THEY LIKE AND NOT NEED TO ACCOUNT FOR THE CHARGES. I have since paid the penalties and all amounts owing for the contract which only expires in Feb 2018 in order to cancel the contract and do a sim swop to Vodacom. </p>