Charged after contract was cancelled within a day

My account has now been debited with just over a thousand rand for a contract that was cancelled the following business day and all hardware and SIM cards returned. Further a technician came out to my residence and confirmed I had no internet coverage and that he would complete such report.<br> <br> There was no coverage at my residence as claimed when I took out the contract. Further the contract was cancelled the following business day. My account should not have been debited and I want a refund.