I sent Cermark an email about a faulty product on 3-24... It is now 4-29 and NO reply. Not, "No, it wasn't our fault." Not "Buyer beware." Not, "You tried to fly it so tough." No reply.
Luckily, I'll just move on.
Of course, it would be lousy if I didn't warn future buyers.
Please feel free to explain how unreasonable it is to expect a reply.
After all, they are busy selling crap.