Videocon Industries — ddb tv

I have a videocon smart ddb led tv, serial number:[protected] purchased on 22/04/2017. From 07/09/2018, the tv stopped working. I called the consumer service the next day, i. E. 08/09/2018 in response to which they sent a service man the same day. He said one of the parts was not working and had to be replaced. He promised to be back in 3-4 days but even after a week passed, so i called the consumer service again and they promised to send somebody in the next 24 hours. I called again the next day and they gave somebody's number to call again but the number was unreachable. Called again to complain but they are not giving any suitable response.