Milton — milton thermosteel bottle not working

Address:

Gautam Buddh Nagar, Uttar Pradesh, 201301

Hello team,
I have purchased bottle on 13th december 2018 and the bottle now doesn't seems to be working as the hot water is just going cold in 2 hours.
And even the outside temperature of bottle is very hot.
Tried to connect to the customer care but no one responds, tried sending the email no response.
The water cools down in like 3 hrs. And such the purpose of the thermosteel flask is not served at all. Since i paid quite high amount (Rs. 850/-) i am not at all satisfied with its performance. More over i could have bought three normal glass flask within the same amount. I have the warranty card, the defect seems genuine.
I hope my grievance is conveyed to the concerned company officials and my complaint is promptly looked into and the defective flask be replaced at the earliest.

Please assist.