Whirlpool India — Denied warranty

Hi I purchased a convertible referigerator
On 9 June 2021
Now the cooling is not as expected so I called the customer care and the technician who came for the service denied the service as the stickers pasted on my referigerator were removed by my child and he also stated the 10 year warranty on the compressor will be invalid as the stickers are removed
It means any one can remove the stickers and change that with a hot gun when it’s in the dealers shop what will be authencity in the product
Plus the warranty are provided on the bills not on the stickers pasted on the referigerator
How can they deny me the warranty and the service
Pls help me
My Mob no [protected]
Name Rituraj
Below are the bills attached