Apple - Sub Optimal Camera on my new MacBook Air

I had purchased a MacBook Air **** from iAstra store (Apple outlet), HSR layout on **-Oct-****. It was immediately noticed that the camera quality was sub optimal and totally grainy. Using the laptop even in daylight was found very difficult given the quality of the camera. Further if was found impossible to use the same for video calls.
As the same was noticed immediately on purchase and I had called Mr. Swapnil at the iAstra store to inform about the issue and to check whether any change should be done from my end to get the same addressed. He promised to call back but may be, he could not reach me later.
I called the Apple support number on *-Nov and they asked me to do a few checks and reboots and press some key combinations. The same did not yield the desired results. I was asked to give a feedback on the feedback section of apple which I promptly did.
I then, visited the iCare Service Center at HSR Layout on *-Nov and showed them the problem. They acknowledged the problem and took the device without any hesitation and promised that if there is no liquid damage(which was not there) they would get the same addressed and informed that there won't be any repair but a change of the screen including the camera. RAF No.SMH****** - This is the complaint number that was shared by them
I received the below mail on Tuesday (**-Nov) and I could visit the iCare centre today(**-Nov). They gave back the laptop and said that the laptop is working as per Apple specifications.
I carried my **** Macbook Air with me this time. I did a comparison of the video quality at the service centre itself (video of the same Click to access IMG_****.MOV ) and showed the same to the service advisor. The video quality was found to be inferior and this was even confirmed by other customers who were present in the centre. I was told that the configurations are different and hence the video quality is inferior on the new MacBook Air ****. To my surprise, the service advisor went multiple times inside to bring the technician , but for some reason the technician did not come out to explain the issue.

IMG_****.MOV
MOV File

As I was asked to sign a confirmation note that the product had been handed over with the issue addressed, I refused and have left the laptop at the service centre.

It is not the first time that I am using a Macbook and hence quality of Apple products are something that I am well aware of.
*. I presently have a ** inch MacBook Air bought in **** from the same shop
*. I was in possession of a MacBook Pro **** which was sold to buy the new MacBook Air ****.

These two machines have given much better video quality that the new MacBook Air ****.

I believe in the quality of Apple products and this could just be a technical glitch which can be addressed. I have not even used the laptop for ** hours. Service report got from the centre is also attached.