QUERY not followed up

REQ***. I lodged a complain with previously and Nomonde responded to my query however she did not do a complete research before she responded. 1 - Check my statement of account and see that the amounts charged on my accounts vary from March until July. I have lodged complains with MTN customer care centres ref no 1st one is ***7 - which states that the prices have increased and my question is that how can MTN increase prices without communicating with me as I have a contract with them and I didn't get any response from MTN. The other is ref no *** - On this email I was told that I was charged for the internet used - this was after I have switched to top- up option. Please follow up on this or otherwise I wont have any choice but to involve my lawyers.