Telkom service on wireless routers

I swopped from ADSL to wireless router at Telkom's persuasion. It has worked about 20% of the time since February this. Telkom via its 10210 call centre takes no responsibility to make it work, does not want to resolve the matter, bills incorrectly (overcharging), then cuts the account and forces me to pay (which I did), closes fault reference numbers and problem resolved and refuses to escalate the problem. Do not know what to do going forward as the family sitting at home with no internet.