My guess is that after Tera receives the old parts they will be glad to compensate you somehow, I'd maybe even mention product? maybe some new 5.38's? I'm sure a product trade would be much easier than getting money, but either way, if that part proves to be faulty, then you should be compensated, if the part isn't faulty and the shop messed up, then you should go after them, but at the very least, definitely follow up!

Peter