Cello — I am complaining about cello flask

Address:

160071

I have purchased cello flask from canteen in mohali few days ago, it didn't worked for a single day, it do not keep temperature accurate for long time, even not for an hour. Online support numbers do not work, it seems like fraud numbers. One number worked and informed me to email at cello. [protected]@ celloworld.com, but when i sent them flask pics then they are saying there is dent on bottom of flask which is no where in picture, they are denying to replace this product. Flask bottom pick is attached.
Lets assume if there is any tiny dent which is not easily visible should cause any issue in temperature. But they are giving bully stories on it and not replacing the flask.

Product details as below.

Bill no — 056193
Dated —[protected]
Card — 53*51022
Rank/ name — subedar/ jagir singh virk
Email adderss — [protected]@yahoo.com (My son email address)

I want replacement of this product or refund amount.