TELKOM ROUTER CONTRACT NOT WORKING

I got a call from sales agents and I was sold a router of which I asked if there was coverage in Lotus Gardens and the respond was yes, of which it was NOT true, I had a cancellation option within 7 days of which I cancelled within 7 days as I couldn't use the router with no network signal. I have completed forms logged calls and every month I have invoice send to me. It is really annoying and irritating to calling Telkom to resolve this matter. I am very angry as it cost me money to call them so many times