Contract issue

I was called by company on behalf of vodacom to offer me a SIM only contract deal, I then took the contract deal and I advise them that I'd like to port my cell c number to vodacom for this contract I was then advised that this can only be done once I've received the SIM card and I should go to a vodacom store. When I had received the SIM card I went through to the vodacom store to process my port from cell c to vodacom, when I arrived at the store they advise that the port should have been done before the SIM card was delivered, and they would not be able to process the port on their end and they called the rewards department, they then advised that they couldn't do it their side as well and I was given two options I would either keep the vodacom SIM number or I have to cancel the contract and redo it with the port. As I wanted to keep the same number that I had I then cancel the contract, I then tried to redo the contract at the vodacom store but the lady assisting me the advised that the other contract hadn't been cancelled in the system and she doesn't want to do new one just in case I get debited twice, she then advised me to come through the next day I came through and the next day and was advised that the contract is still not been cancelled! I am getting very frustrated and would like this matter solved as soon as possible as this should have been a simple transaction if I was advised correctly the first time around.