DUPED in a Contract and bad customer service

I signed up for C Fibre in 2017. On installation, I was offered 3G ****le, which I refused to take because i have no use for it,but consultant insisted that I take it because it was not going to cost me anything as it is part of the deal. Since then, I have not used that ****le not even once. On inspection of my statement, i just realised that I have been charged R75.00 for the same ****le that was meant to be free. I then started investigating from Saturday onwards and I was told to call cancellations on Monday. I called cancellation first this Monday Morning to have this service cancelled, Spoke to clive at cancellation who advised that he could cancel, but that will mean losing my refund.In order to get my refund, I needed to have a cancellation done by fibre division. Clive transferred me to the fibre division,got through to Malosi to whom I repeated myself after which he also transferred me to a gentleman(I don't think it is even appropriate to call him a gentleman) Mthokozisi at Fibre billing. what a Rude and un helpful agent. He has so much arrogance and told me that it was not his problem if the sale's person did not mention that I will be charged for this after 12 months. I tried to make sense and reason with him, but e didn't even try to listen to me. I asked for him to check if I had used that card once ever since they dropped it off with my fibre, to which he said he didn't care. I don't know how they hire and keep such people who are supposed to give ''customer service''. I need this contract cancelled and all my money charged refunded.