I asked the bigger shop address in Kaizen,they refuse to recommend any. By the way i am in ahmedabad ,it looks like i have to post in FB groups to find someone who can understand this problem or suggest better shop.
Get your PC back from that repair person. I doubt you'll get much progress if it remains with him.
If you're GPU is back from RMA, try putting it back in your system and see if it boots. If not, then take it to bigger shops or better, contact yout local MSI service center to see if they can check your system. Most likely they will not, but with enough pleading and proof, I think they may take a look.