Disgusting service is to mild a word for Cell C Rosebank Mall

I am writing this on behalf of my mom, She had contract for 2 years with Cell c for 2 phones and now her contract ended in March, so now they said she must come and cancel it at cell c or she must call them.She went to cell c store in Rosebank mall where she she opened the account and now they can't help her they said she must call cell c.She tried calling them and now they don't want to cancel the contract they are busy deducting her money.