LG Electronics — ac installation related complaints

Address:

New Delhi, Delhi, 110068

I purchased an lg five star ac through amazon. Engineer came after four days and installed it. He charged 6500 and denied to provide any bill. He broke my exhaust fan and use different colors pipe as provided by company. He promised to change the pipe but he has not changed. The name of that engineer is nazim. I contacted his supervisor arjun pandit too.
I sent him photo of fitting. He also did not take any interest.