Having a problem after shipping a part

I would like to see the proof from both sides. Surely there are some PMs and a carbon of the MO.

I think proof by the buyer would have been less childish than calling the authorities in Canada. That will do no good but make things worse.
We had made the deal through Chat and exchanged e-mails,he was then banned by a Moderator for being a dick.This deal had absolutely nothing to do with his being banned.But it seems he,s back!