Sansui India — led tv purchased in oct 2016

Address:

Type 1; B/16; 794 Rcf colony, Chembur, Mumbai City, Maharashtra, 400074

I have brought led tv in oct 2016 which is showing a line from left to right in middle of screen... My tv is in extended warranty period.. Plz help to whom should i contact.

In 2018 jan too the same problem was there but was resolved by changing the panel itself... But this time the ccustomer care of sansui number is "not valid" im
Need to know whom to contact even if i have paid etc for extended warranty