Inaccurate charges

I have ordered fibre from you beginning June. Had an existing contract for adsl. After talking to numerous agents nobody could tell me if I will pay penalties upgrading to new contract. Anyway I decided to cancel my order with Vumatel on the 4th June. That morning CourierIt delivered device. I phoned Telkom to collect device because I cancelled. On the 8th the courier company came to collect device . I got my statement today where you have charged me for device I gave back. Please fix this asap. Courier slip no ********** 3