Amazon — service delivery standard

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Amazon, 560037

I have ordered a led tv on amazon, which was delivered on time. Installation service was booked and scheduled on 21st july, when the technician opened the box for accessories which was with tv was not compatible, as tv is bigger size and the wall mount board is very small size.in between the service provider called and insisted me to buy accessories from the technician.
I ha6 informed the same to amazon, they asked me get service reports from the technician, however the service provider manager called and confirmed that there is no service card provided by amazon to them nor they make any reports.
All information were step by step updated to amazon. They asked me to share the pic6of tv board and the wall mount board. I sent to them. They s scheduled a visit by the technician to verify the issue to resolve, on 23rd 10 am to 12 pm, however i have found the technician mobile number was not working and out of service.
I have not recieved any call nor attended by the technician.
During the period had multiple mails and calls happened, but no single calls received from amazon for any update.
I have attached the mail, request number technician details here with.
Now i have called ama6 and raised again a request for resolution.
Till now i have not even able to check the tv whether is working or not, but unfortunately due to non installation i am unable to do.
Now i am really wondering if by any chance tv is not working, then amazon may easily say that my return period got over by 29th july which is date.

Whenever i am calling customer care of amazon is saying that service is from vendor, so i have to connect with vendor.

If that case how then amazon is running the market if the responsibility is with customers to reach the vendor? What is amazon role? Only to sale the product? Who's ownership to ensure end to end service delivery??

I request to consumer to en