Sales person lying paying R1700 a month so the min and sms can expire every month

I took out a contract out at the vodacom shop in Potchefstroom mall and the sales guy told me that I can transfer the minutes and data I get with the contract, so the plan was to split the minute between myself my wife at the time and her sister but ja now I'm paying R1700 a month for not using more than 5%of the contract I did try to speak to customer care but every time I get transferred because this person can't help me i honestly don't know what to do anymore,