Cell c staff does *****

I’ve had a cell c prepaid sim card which has been sim swoped without my concent now when I had gone into store with my information after calling the call center the store says they cannot help me I must get another number, firstly ***** has taken place the cell c consultant that had issued a sim swop should be dealt with because no security questions were asked to them but secure questions are being asked to me as if I’m the one that’s wrong, I’ve answered the questions but that’s isnt good enough for them, this number were mean to be on a contract by next month it’s a business phone the number is on all my business cards what should I do throw away my cards and say let’s forget about my Custormers that have my number!!! Cell c is at fault but I must go throug hell having to be calling the call center the entire day and visiting stores!!!