Poor service, just fed up

I have 2 contracts with MTN and every month i have problems with them. i signed a contract for R249.00 for one line and the other R368.00 a month and every month they bill me incorrectly and the call center keeps telling me the data and message bundles have not been discounted and they will load a query for the discount. when i pay the correct amount which i signed for (R249.00 + R368.00) they disconnect me and charge me interest fees on top of an error they have made. i make a call to MTN every month to have this sorted and no one fixes it.<br> Today they have cut my services after i paid my bill in a MTN shop and the V&A waterfront 2 days ago, same thing happened last month. how is it that MTN is quick to cut me off but not quick to rectify the error in their system that keeps charging me incorrectly.<br> <br> Now i am calling the MTN call center and they are closed today as their services are disrupted.<br> <br> should i even bother to pay my account if MTN cant be bothered to fix my bill, i have never been late or not paid my account yet the service i am receiving is getting worse and worse.<br> <br> I would like someone to please help me fix this as i do not want to stop paying my account.