Wi Fi ADSL INTERMITTENT FAILURE

Well Telkom was at my house just a pitty i wasn't home the **** was she was told there is nothing wrong with my phone line and Router THEN WHY IS MY WI FI ON ONE MOMENT AND OFF THE NEXT ? I'M HOME FROM 5PM ON WEEKDAYS AND AT HOME ON WEEKENDS. IT DOES NOT HELP TO KEEP PHONING MY WIFE AS SHE'S AT WORK AND IS NOT ALLOWED TO ANSWER HER PHONE! MY PROBLEM IS WI FI AND ADSL INTERNET RELATED NOT THE PHONE LINE!!!!!!!! I'M NOT PAYING MY TELKOM BILL END DECEMBER AS MY PROBLEM IS NOT FIXED AND I'M NOT PAYING FOR A SERVICE THAT IS NOT BEING DELIVERED