Hi
last year I purchased hitachi window ac. its performance is very good. due to summers approaching this year I booked a servicing request. after two days two technicians reached my home and beleive or not they were totally inexperienced. They broke my ACs plastic duct. They also forgot to screw the nuts of the ac.
I think that these companies do not take care of provinding quality services especially when its under warranty or when they have to provide service free of cost