Like that how to return any dead-on-arrival purchases from China?
Out of the box already not working properly. Send back costs more than certain percentage of the purchase price, might as well order another one?
Don't bother shipping back. If the item is DOA, take photo/video, ask for refund. Sometime you may not get full refund but at least partial or some compensation, from the seller and forwarder.
From my own experience, TB seller with few diamonds rating and above, are usually honest. You can get instant reply with Aliwangwang chat, usually within a minute except after 12am of course. I had ship a big 26" alu luggage before, internal design did not match the description on the webpage. They claimed the design was changed due to customer feedback, yeah, whatever. Well, at least they tried to solve the issue, at the end they shipped additional items that were stated on the page. Still, I had to pay for the 2nd shipment--35CNY.
Others are better, a hard mousepad was damaged by the forwarder cause they junk all the items together to squeezed in every inch of space. Seller offered to either send another item FOC or full refund, I opt for half the item price as it wasn't their fault. forwarder act blur and only offer some discount for next shipment.
I would say, generally, TB seller are as good as any genuine seller, even better than local beng seller. The main worry I had is almost always the shipping forwarder, inefficient and unprofessional handling.