L.G. A.C Problem

Location/place: Najafgarh, New Delhi

Name of company/service: L.G Electronics

I had bought a window a.c of 1 ton in the april 2012 but i lost the bill. When i requested for duplicate bill Dealer is saying you will not get duplicate bill. A.C is giving a lot problems and L.G company is not ready to repair it. They are not ready to take any action against the dealer as well. Kindly assist me what to do now.
Anand Sharma
+91-9560346499