DNA Transcription.
Honestly, you should have given the board to Rashi directly rather than giving it to dealer. During this process, there's no way telling what must have happened. Either the dealer must have tried something in the process and made it worse than it was according to what you've said. This is the part where anyone will be suspicious on the dealer if not the user.
Question set #3: Did you accept the board and then return it or did you reject it on the keshav computer's desk itself? In any case, why didn't Keshav computers check the condition before accepting it from Rashi? When you bought it from Keshav computers, did you get a proper bill with serial number on it?
Ram was damaged? That's it? Okay, what did really happen that ended up killing the board and the memory kit? Did you bump up the VDRAM? Any burnt marks on the board/memory kit when this happened- or any smell? Happened during usage? when you booted? Which surge protector/UPS/Power Supply?
Well, all thanks to this, it looks like you were able to make the required time afterall.
What excuse did keshav guys give for not checking the board? Did you power up the board before giving it to keshav?
Did you have a proper bill with the proper serial number?