eBay and Craigslist finds

Googled his phone number and he's been 'selling' a few bikes, always in different places in London and always with a different name.
Can people like this be shopped? It has to be dodgy.

There is a 'Report' option on Gumtree.

I've used when poeple have an item in the wrong category.

With this guy the wording sounds very familiar,
I don't know if Gumtree ban people/phone numbers?