Hitachi — hitachi ac not working at all

Address:

150/7f ward no-2 garhwal colony mehrauli new delhi, New Delhi, Delhi, 110030

I bought 2 AC in 14/04/17.. one is working good but other has some manufacture defect. That I told many time to company please replace my default ac ... but they sent technician to resolve my problem which is not solved .. my .. i simply want to resolve my ac problem...about my experience with Hitachi is really. Not good I must make sure that in my company we don't use Hitachi product in future...