[Resolved]  Voltas — ac stopped cooling

I suppose this is my biggest mistake to purchase voltas. I purchased due to its brand name. I purchased Ac in June and the technician which come to install was his first installation and they took almost 12 hr to install and from that day problem started. When I complained yesterday about its cooling problem, they assured me to send technician with in hour but no one contacted me neither arrived my house. What I found that they are not responding to my registered mobile number and when I call with other number, after registering my number customer care disconnected my phone.

I go by voltas due to its brand value. What should be done in this case