Overcharging me; ignoring ALL my requests.

I signed a contract for R79.00 per month (no cellphone included). However, since the first statement I have been charged about R109.00 or more. When I told them that they are overcharging me (in July 2015); they told me that the amount they charging is correct.<br> I have a copy of my contract and it clearly states R79.00 per month.<br> Since then ALL my e-mails have been ignored. *** 16/8/15.<br> I also phoned them in January 2016 explaining the situation, but no-one phoned back. I received another reference, but still no response.<br> <br> I want MTN to stop overcharging me and reverse all the overcharges since the start of the new contract. <br> <br> Obviously the fact that I have been a loyal customer for 20 years do not count for anything. As soon as my contract expires I will take my business elsewhere. This is not the first big problem I have had with MTN, Unfortunately their service has really gone down the last year or two.<br>