Cell C Sim Card

I have a contract with cell c , now their simcard is not working since Tuesday. When I report it to them they are telling me that I am responsible for the simcard so I must buy a new simcard. My issue is that I am paying for this card and phone every month but they are pushing away the responsibility when its faulty. How can I buy out of my pocket a new simcard while I am busy paying for it every month.<br> <br> This is disgusting.