contractual disputes and over billing

My contract was due for an upgrade last year in September. A vodacom consultant called to confirm the upgrade and I agreed with him that I don't want any changes to my contract and want to keep my old number. Surprise surprise when I received my new phone they gave me a new number and changed my contract without notification. My daughter called them and laid a complaint, after being given the run around they agreed to send a courier to pick up the entire package*sim card and phone included* and reinstate the old contract. Everything was thought to be going smoothly until we realised that I am still being charged for the new number that they took back and supposed to be cancelled.I was paying double. My daughter again had to call them and lay a complaint, the consultant agreed that the sim was supposed to be cancelled but wasn't. An sms was 2days later sent and they confirmed the sim has now been cancelled, but nothing was mentioned about me getting my money back. We again called to enquire and nothing about the refund was logged onto the report,but were informed that they shall check it and respond in 24-48hrs. Vodacom is a real headache and we still awaiting their response