[Resolved]  GTPL — Bad internet connection

I have GTPL broadband connection since 1 year in the name ID : plastic 1983
I have taken the unlimited plan.
But since 6 months, the net is not working properly . It get disconnected half of the time. It gets disconnected every evening from 8:00 pm to morning 8:30 pm. So, I have used only 50% of my net limit. I have called the customer care several times. But NO any technician has come yet to solve my problem.
I am surprised for this POOR SERVICE.
You must resolve my problem within a week otherwise I will file COMPLAIN IN CONSUMER COURT.
Or I want my REFUND back..