Vasanth & Co — Poor and cheating response from vasanth & co for sunflame chimney

Address: Chennai, Tamil Nadu, 603202

I bought a sunflame chimney 2 months back from vasanth & co, chennai. To deliver the product on 23rd may 2017 after lot of complaints [delay delivery]. And while i bought the product they said the installation is free. And today [24th may 2017] sunflame people come to my home they ask for rs.1450 [350 installation and 400 for hole and 700 for material cost in the bill also they are not mention about the installation cost or material cost. [but in my home it is back to back connection only]. So i called vasanth&co and asked the details about their false commitment. But sunflame people call me and they are talking with me in supporting vasanth & co. I dont know how to handle this.
For the same product saravana store do free installation...