Over charging

I have signed a 2 year contract last year. However for the last 3-4 months I have been getting debited R410 a month. When I did query it, mtn tells me that's it's due to inflation!!! Hello I signed the contract. If it was a new contract but advertised at an older price then I would understand. <br> Not so long ago mtn was taking out money for the mtn dating service which I did not subscribe to and which I didn't even know about until I saw money despairing. Oh come on mtn it seems that u love money. But please don't ***** it. I am a loyal customer. U get paid promptly.just hoping my 2 years go much faster so I can cancel my contract faster.