sim card stoped working

Firstly no service for more than a week tested on another phone so suspected it was the sim. When my husband went in he was asked to pay for a new sim which was not even 4 months old to begin with and why are your clients responsible for a faulty sim card??? Then when i told the guy who he cannot remember the name of that he is not happy about this he was informed if he complained about this he will get bad service from cell c are you guys for real????? Absolutely shocking and after the contracts expires i will not continue with cell c as this is utterly disgusting to say the least! Threatening your clients that they will get bad service ***