Printed Crooked, and I didn't get 50!

Usually I have no issues with any of my orders, but this batch of mailers was really disappointing. First, I order 50 and only got 46 (Counted it 3 times just to make sure!) and the printing was super off, so one side of a lot of my mailers is barely sealed and the other side has extra, so I'm scared to mail things in them in case it ripped in transit because it's so thin. Also from my mockup that I approved, the full bleed printing was off on all of them at the bottom. Very sad :(