When I had a problem with a machine sold to me by Warco, it was replaced (The replacement was worse quality, in another way, than the original ) but exchanged with suitable compensation, for another product.
Before that, I had a machine which shredded a V belt within 6 month, from new. I realigned the motor, and the replacement belt has been operating for over 20 years..
As with far eastern products, it has not been totally trouble free, but has functioned acceptably for several years..
Face the fact, if you buy nylons, you cannot reasonably expect silk stockings!
You can't expect top level industrial quality in a hobby level machine. You get what you pay for.
From what i saw, it was bad that the machine was rusty.. But the imperfection was unsightly, not so bad as to render the machine unuseable.
Trying to view things from both sides, Warco lost money, and reputation, on the deal, and the buyer got an imperfect machine which is still quite capable of doing the job for which it was intended..
Howard