Daikin Air Conditioners / Daikinindia.com — new ac cooling issue

We has purchased ac from vijay sales on 7th july which was delivered to us on 11th july and the installation was done after 1 week approximately.
The ac installation guys were not trained enough as at the time of installation only they said the cooling is not happening then next day other guys came and did fitting and charged 6000 rupees for installation of ac. After that we had felt that the cooling is very less. Now it is working as fan only no cooling at all. We had raised complaint on 6th september and today we got person who said we have filled nitrogen gas in comprasor and now he will keep it as it is for 2 days so more 2 days gone. It's worst service ever.