False information and hidden contract sign up

I took a contract a few months ago from Cell C and was given 2 sim cards along with the phone and was told by the Shop that the second sim I can cancel after 3 months due to it being 300mb which I have to take. Yesterday phoned to cancel that sim only to be told by Customer service that I have 2 contracts and if I wish to cancel that 300mb sim I must pay penalties. Went back to the shop and was informed that I should have cancelled sim after a month. I was told in the shop when I took the phone that I must wait 3 months before I can cancel it if I don't want that extra simcard, but now all of a sudden is on 2 contracts which the 300mb almost works out R100.

The shop said I must call customer service to tell them even after I told the shop I did already. It seems like Cell C is fine taking money but when it comes to complains they just don't care and won't listen even when explaining a few times over phone they just say, to cancel will include penalties.

Will never take any type of deals from Cell C ever again.