Airtel — Xstream Fiber Speed Issue

Such a pathetic service by Airtel. I am complaining about speed issues by past 15 days, calling them daily for resolution but no one cares. I have a 200mbps connection and m getting speed of 10-11 Mbps. They always told to do some settings but never worked. Then they told that it will solve in 2 hours and will confirm via phone if issue still persists.
They promised and raised complain that an engineer will come to solve the issue but nobody showed till today.
I already paid for 3 months subscription for 200Mbps connection. and now they are exploiting us. Refuse to solve my issue totally.
Such a ignorance in Work from home cases cant be tolerated.

Please fix or return my money. I will get a new connection from someone else.

Note: People dont take advanced subscriptions, they will take us for granted.