Being billed for no service

I signed up with Afrihost (Fibre account) on 25-07-2017 with the promise that it will be installed within 4 weeks. Every time I contacted them the call centre is either too busy or they drop the call after waiting for 20 minutes. now 3 months later they still have not installed saying that the "area is not active yet" although both my neighbors have active Fibre accounts with Afrihost, 1 of which order a month after me and had it installed and activated within a week. Now I have cancelled my service and they want to bill me for the ""services"" provided.