[Resolved]  Sify Broadband — Slow internet speed

I am having SIFY broadband connection. (Plan - 256 Kbps -500 MB daytime, Unlimited on Night).
But at night time I am getting about 20-40 Kbps (not download speed) of internet. I complained 2 times. Everytime one person called me, and told me that my complain was forwarded to Back end team. I checked the status after few days and found that both cases are closed and status was - "Issue Resolved".

What a way to cheat the customer!!!