Vodacom *****ing from you

When my two year Vodacom data contract expired the sales team phoned me for an upgrade. I received the new router and simcard. and they said the sim swop will happen after 48 hours but never did so I was still using the old router and simcard. I never received any contract or statements from them but I noticed that I am paying double for the contract. Turned out instead of upgrading the contract they opened another contract and charged me for the old and the new contract although the one contract's sim card has never been activated and the other contract expired and was upgrated. So basically I have now paid 7 months for a extra data contract which is not activated. I have phoned every department in vodacom and no one can or will help me they just keep on referring me to the next department. They refuse to let me listen to the previous recordings and said they new sim was activated it is not their fault the data settings is not right. As soon as I am able to sort this out I will never do business with vodacom again. They are sneaky thefts