Snapdeal.com — invalid windows 10 professional software license

I purchased windows 10 professional software license key on snapdeal.com on 04-mar-2020. License key was sent via email within an hour post order placed. I immediately tried to activate using the key provided, unfortunately it was failing and hence contacted seller with screenshot. As per the response received from the seller, i did the clean installation and when tried to activate, it was not working. Hence, contacted microsoft as per the response received from the seller.
Microsoft clearly stated that this license cannot be used for retail user as it has been sold to some business as a part of business license volume program.
I had daily email follow ups with the snapdeal from last 2 months. Each time they are replying with one of the standard responses such as
1. Get email confirmation from brand that they cannot activate the license to assist me
2. This product cannot be refunded or replaced as has been delivered to me in good & working conditioner
3. Share the error message what i am getting when activating
The support team is very well trained to handle such cases and standard responses. They are not providing support asking microsoft to activate the license key sold by them or not giving email confirmation that they have sold valid retail license key.
Now they have stopped replying my emails from last 3 days. These are emails with whom i was interacting aman bhatnagar, ankit ranga, snapdeal.