Blue Star India — ac gas leakage (1.1yr old) now 0 cooling

Last year march i bought an ac. Last month the ac cooling reached zero. It was due to the gas was out since there was a leakage in the outflow valves. May be it occurred due to bad installation. Now the service dealer is about to charge me 2800rs for gas reacharge. It was the installation fault may be and now nobody is solving the issue. Since it was a small leakage it took almost 1yr for 100% gas to finish. And sue to thie small change we were also unable to find the issue. Now the ac cooling is worse.

I was not notified about any free service during the first year.
Poor service from bluestar and the seller qrs kottayam