Mitsubishi Electric India — 1.5 ton split a/c

Hi, i bought a 1.5 ton inverter split a/c on 1st july. The installation was done by balaji aircon, delhi. And with no doubt i can say they have the worst staff. The installation guy did not install it properly and there was a problem in flap, and then after 15 days we get to know there is no gas in our ac. There is a gas leakage in the a/c and it's been 7 days we have registered a complaint, but they are not coming to resolve the issue. I hope mitsubishi hears this complaint and resolves it at urgent basis. I would be really grateful to you.