This is a complicated one but I'd be grateful if you stay with me.
I got a Giant TCR3 bike through a cycle to work scheme and then had a few issues with it. The supplier (that was specified by my work place so not my choice) said, that's fine take it to your LBS and if it needs paying for they'd foot the bill.
So I took it to my LBS and mechanic there messed about with it and semi sorted the problem I went there for, THEN, he asked if I'd had the seatpost trimmed at an angle as this was now Giant spec to prevent and chances of damaging the frame if the seatpost is rammed right down for some reason. He said he'd sort it out for me, I said fine that's great. He then made the most wonky cut possible across the seat post (it's aero so wouldn't go in the guide and then put everything back together. They didn't charge me for this so I thought great.
All was well I thought until today when I changed the saddle and consequently needed to move the seatpost. This was when I found a crack in the frame just below the seat clamp where it seems it was over tightened
(
https://www.flickr.com/photos/44546121@N04/15121089102/ ).
The threads on the seatpost clamp also appear damaged.
Any idea how to proceed with this and if I have any leg to stand on as I have no proof of anything and they could just deny everything.
Obviously I haven't had a chance to speak to the shop about it as it's late but I'm now massively stressing about it.