Here’s what consumers have asked with answers from Buykud staff and previous consumers.
They say they accept returns, but they don't. If you fill in the form for returns they have, and follow up via chat or email, they will say "we will send you instructions" and never do. I've dug around online and it seems consistent that Paypal backs them in their dodgy practices. I was denied a refund, despite illegal status with Australian Consumer Law... but hey, Communist China gives zero respect to the laws of anyone but themselves.