The trouble I find with very ravely thread is the 1/4" seam allowance isn't big enough and they come apart over time. I'd use 1/2". If it's already cut, would fray check stop the raveling?
Is there any other problem with the fabric? Color fade or bleeding?
If it's #1 quality fabric, let the manufacturer know. They might not even realize the problem. If the manufacturer has a good reputation, they probably want to keep it and would probably want to correct the problem.