If you have some problems that are definitely broken, then you would have to contact Model Expo - well, actually, I just remembered that on Model Expo's website, they have a form that you fill out online to request broken parts. But, I am not sure if your situation would qualify since the part(s) can be reformed the way they should.
Now, on second thought, this really is not good in my opinion as M.E. should be careful - as I am thinking that these parts are not coming out of the mold like that. Or, are they having to pry the part(s) out of the mold - I am not sure. But, this does not speak well of quality control at all in my opinion. They can and should do much better than that.
I bought the Sopwith Camel when it was on sale about a month ago and I have not gone through any parts - I just set the kit aside - now, I guess I need to go through mine to see what horrors await me.
Also, another thing is terrible - why in the heck do they have to fold plans? The box was just like 1 inch too short. the proper way is to ROLL the plans up in a tube. They either need to make their box a little larger or plans a little smaller. Also, the Camel, the wooden parts were way too loose in the box. Again, Packing problems.
So I do understand your frustrations.