Cancellation

I took a contract at telkom for 20g data,to pay R299 for period of 24 months. When I got home the same day I connected the router only to find out there was no network coverage. I took the device back to the store within a period of one hour and explained to them that there no coverage where stay. I even recorded video of the device to show them that there is no signal or coverage where I stay. They told me that they can send a technician to check and fix the problem but it will take a week. But then with the reviews I read on telkom website regarding that I decided to cancel the contract. Then they cancelled the contract , I have the paper work for that as well even their call centre called me as well I have the case numbers for cancellation. Today telkom debited my bank account R1033 I really don't know what they are billing me for. The staff at the branch at Eastgate mall are so *********** and unprofessional . I returned the device to the store within 2 hrs I don't owe them anything. The agent who assisted me her name is Mokalegv