Unfortunately this kind of incident happens all the time, even on sites like ebay it’s common place. I give everyone the benefit of the doubt for a certain amount of time, then i let them have it!
For years I bought and sold stuff used and made sure people got what they paid for, too be honest there wasn’t really any money in it, but it was good for research into my bearings and for learning how to service frames without them being other peoples, damaged a few in the early days.
If you paid via paypal make a claim, if you paid via another method contact consumer direct and see what they think is your best option.
Me I would just avoid dealing with LYons, who needs the hassle?