How do you know the seller did that? Was the drive inside not a WD drive? If there’s evidence of it then you could simply open a case with eBay, They’ll help you out. I’ve had issues similar to this with flash drives saying they have 256gb capacity but it being a fake. eBay got my money back ASAP and I still got to keep the dirve.
I’ve also read while researching a potential HDD upgrade on my My Cloud that it’s not quite as easy as simply swapping a HDD in a My Cloud, the drive has to have the image on it prior, not sure if that’s what you meant by “using the guides available here”. If not this thread should help: Rebuild your My Cloud or upgrade the HDD on it
