If it were me, I'd contact the shop. One, so that they would know and could take steps with the manufacturer and two, because they really didn't do right by you in the customer service department. Since you have the manufacturer backing you up, it's not like you were being difficult. You KNEW something was wrong. I'm sorry that they couldn't see it that way, but in their defense, the whole bolt was like that so it may be they couldn't think any further than that.