Unable to connect wifi since July 2015????

I app**** and paid for my Telkom landline with modem/ wifi in Juky 2015. The installation took place when we were away, but since then I have failed to get any help with the wifi. Telkom technical enquiries takes over 30 minutes to answer a call, and every time it's the same thing - reset the password and turn off the modem for a few seconds the modem itself was deemed faulty, and subsequently replaced. But still nothing. . I have been billed without fail every month for wifi but have been unable to use it. Can someone please help????