paying for non-existant contract

During Dec 2013 I was contacted twice by vodacom to take out a contract - 3G Laptop and Rooter. It was on promotion. I agreed to one contract only. In October 2014 I picked up that they were deducting for 2 contracts and I only received one laptop. I then called them immediately and they asked me to fax documents which I did. I then got a call from the investigators saying that they picked up that I only received on laptop. But till today I am still being billed for 2 contracts. I contacted the call centre but they keep on saying that its pending. I would like them to cancel the contract and refund the money they have been deducting for the non-existant contract. And for someone to call me and explain why its taking so long even though the investigation is complete. I hope this issue will be sorted out asap as legal action seems to be the next best step.