overcharged for contract

Good day i have to write this note with extreme displeasure, my husband took out a contract over a year ago with Vodacom only to find out a month into the contract that we are be charge for two contracts then once we went into the vodacom service center Gateway we put in a complaint and they called us back they can see we being charged with two contracts but could not stop it.We have been back and fourth about this and to no a vale Vodacom is not doing anything about it the contract finishes in march 2018 and still be charged for two contracts. Is there any other people that can help with this case.