Poor Service

Cell C is so pathedic i called the call centre to order two tablests for my kids they delivered wrong ones. I call them on the same day of delivery to collect the incorrect devices bare in mind i didnt even open it. They took aa whole month to collect the devices. The devices are now collected 4 weeks after the collection they still billing me for the same devices they collected how is this??? I went to the cell c store to check if i can cancel or get just a data sim and still the device contract is still running. Please cancel that contract so that i can be able to cancel my contract with you. My Cell C number is ***