I bought a Pixel 2 xl last month, it had display issues so I got a replacement from Google which took about 3 weeks.(Luckily it was during late Dec/early Jan)
Now the replacement device has also developed issues,eg often won't connect to my PC and there is speaker rattling. I can't afford to send it back to Google as it would take roughly 3 weeks (from the support guy) so they advised me to get a replacement from the retailer (Mobileciti) as it would take much less time.
But MobileCiti says they can't replace my device because I already got an replacement from Google thus the IMEI is different.
Any help would be greatly appreciated.
I suspect there is another part of story that OP is not revealing. If OP got faulty phone in first place, why did he/she go to google and not to mobileciti. Now OP received replacement, they why he/she is not trying to go back to google and get replacement.