Recently I bought a guitar from a guy over at UG, and it arrived.
The packaging wasn't brilliant, and arrived with a hole in it - it'd taken a good knock.
After removing the strings this morning, the knock seems to have wobbled the neck in a hefty fashion, leaving one side of the neck join with paint cracked off it, a hairline on the other side, and the neck shifting back and forth against the body.

What's the best way to deal with this? Ask the seller for my money back and ship him his guitar? Discuss insurance payments from the parcel company? (Although I doubt they'll cover the actual cost paid). The payment was made via paypal purchase of good, adjusted so I covered the fees.