A spring inside the seatpost? Are you sure you aren't looking at the threads? If the threads in the clamp are stripped, a new bolt won't help (and it would be dangerous to try to hold a stripped clamp together with a new bolt...) But yeah, if they stripped it out, they should replace it.
Honestly I don't remember your original story (and pardon me for not going back and searching for it) ... but if you didn't pay for a pre-purchase fitting, then I don't really think it was so terrible that they ordered the bike by your measurements alone. That's how any LBS would do it. It seems to me that exchanging the frame is going above and beyond. Stripping the frame you have and building a new one back up is quite a bit of labor, and it likely won't be easy for them to sell your used frame. (Though if you did pay for a complete fitting before you chose the frame, then you're right that they should have noticed your biomechanics during that fitting, and it's only right that they exchange the frame.)
It's a pretty bike, and I totally get your frustration, but I'm not seeing from this thread how it's the LBS's fault. Anyway hope it's all taken care of soon.
Last edited by OakLeaf; 11-14-2012 at 03:45 AM.
Speed comes from what you put behind you. - Judi Ketteler