From where did you buy One Assist for Hisense? I checked the one assist website and they do not have Hisense under the brands covered:
https://www.oneassist.in/faq/home-appliances/ew/
Then i was reading Amazon reviews for all these companies offering extended warranties and a customer wrote that one assist will take money for all brands but then not repair the product saying the brand is not on the list. Most of the reviews are also paid, guys have revealed that amazon vouchers are offered for 5 star reviews.
Frankly after spending some time researching these third party companies i have decided not go with these services and just pay 5k extra and buy official hisense 3 year warranty product from croma or save money and go with Flipkart 1 yr one, better not to entertain headaches associated with third party extended warranties.