Cell C, is hell... I...

Cell C, is hell... I've settled and cancelled my contract with them last year December and the number is now prepaid and I am not using it because the consultants of Cell C are harassing me everyday, I logged a complain with cell C and indeed they agreed that I don't owe them but the consultants are still calling to this day including this morning. I'm not a rude person but I'm really ****ed off with cell C to an extent of discouraging everyone I know from using it