Madn3ss,
You said that you sent a letter in the box with the return of the sills and the return of the mask for warranty repair. You are on this site a lot, so I would be shocked if you wrote the letter long hand. Go to your computer and print another copy of the letter for them, and nicely hammer on the point that if they received the mask then they received the sills. Even if they cannot find the sills, they would have a record of the mask since they would have sent it out for the warranty work.
Obviously, you need to kick this upstairs. The people that you are dealing with are not motivated to fix the problem, for whatever reason. But someone there should be.
Good luck and be as nice as you can be, even if it kills you!
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