Cell c store consultants Chatsworth center

Cell c Chatsworth center is the worst store. Non of the consultants can help you and they have an attitude. My mum has finished paying her full 24 month contract and they still billing her after telling them to cancel it. Her contract was 400 a month. Now they saying she has to pay 1600 towards the contract which she stopped using long ago. So she asked many consultants in the store to help her dial the call center so she can query they said they not allowed to do that what bull ****.