OVER CHARGING. WITHOUT PREJUDICE

Good day. i posted a complaint about a month ago about being over charged for data. I was contact by someone at head office and was told the regional manager would contact me to sort this issue out. I have yet to be contacted as to the issue let alone have the issue resolved. I was previously charged for 2gb data a month for R149. I had asked the salesman before i had signed the upgrade what the price was and he told me it will remain the same. When i received my first statement i was over charged R249 a month. That's when i had sent through my previous hello peter complaint. I am tired of MTN taking their customers for granted. I am not the only person to send through a complaint similar to this. I want the issue resolved as promised. Unfortunately I feel like I've been taken for a ride and would like to cancel my contract if this issue is not resolved as soon as possible.if NOT I will then have to seek legal action and will contact the Chamber of Trade and Commerce. All i want is for my contract to be resolved and to be charged what was agreed upon with myself and the salesman at Cresta MTN. My wife is witness to this as we signed the exact same contract for her on 1000 minutes