Mtn taking my money with no service

I was sold a home internet with a router through the phone telesales. My address was confirmed 100% coverage. When the package arrived, the router was unable connect to internet for more than 2 minutes. I phoned mtn technical team and I was told that there is no coverage for home internet in my area. The wrong address was used to get the deal through. So I asked to cancel the package within four days after receiving the package in December 2025. I was put through mtn cancelation department and I asked them to collect the package through the courier company as it was delivered by them and due to the fact that it was going to take me a month or two to get to the nearest mtn shop due to distance and work commitments. I was told that it was going to take 3 weeks for courier to get to me. Had no choice but to wait for it. January 2026, I got the invoice from mtn for a debit to go through end of January. Phoned again mtn to find out about the cancelation and picking up the router. Told cancelation was not concluded because they had not received the router. I have since returned the router and I am still getting invoiced and my account debited.