*****ed account and terrible service from vodacom

My data account was upgraded without my knownledge wen I informed vodacom they were very slow on the matter till this day I haven't received any feedback from them I had two contracts with then I have since cancelled 1 nw I can not cancell the *****ed one because it says I'm only due 2016 for an upgrade . My instalment has gone up but.I don't have any benefits wat so ever my money is just being taken from me for no reason . Vodacom is *****ing from me en I can not reverse payments because they will put me on black list please help .everytime I call vodacom cancelations I get the machion nw I'm very frustrated.