No customer support and incorrect billing

I cancelled my expired contract thru the MTN shop in Langeberg Mall in Mossel Bay , the lady phoned them and everything was done.<br> after 6 months the contract is not cancelled and they still billing me .<br> My other contract what we upgraded are billed incorrect and the blackberry internet that we do not have are on there as well ,the invoice total are also incorrect.<br> I am trying for 6months now with less than zero results .<br> Hope fully they contact me now.