Robbing customers

I opened a Mr price account. When I collected my card Instore after signing all the documents the sales advisor gave me a simcard. I told her I don't need the simcard as I'm using a contract simcard. She advised that I don't need to use it but they just give it with every account opened. After receiving my statement I saw that I'm being charged R99 per month for this simcard. I queried it and they advised me it was just for the 1st month. Months went on and they kept charging me this amount every month for something I'm not using. I went into the store and tried canceling this simcard. I was advised to email the support team which I did and was told it will take 31 days to be canceled. 31 days is gone and still no luck.