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Take a gang.
Call the Police immediately once you know the meet location(and you are nearby).
It will take them up to an hour to arrive and the person with your bike will surely want to leave.Maybe ask a friend to take video (in a non-confrontational way), definitely take pictures of the bike they are holding.
You need to decide yourself but if it were mine, I'd get my hands of the bike and then say this is mine and I'm taking it back. While said friends arrive to help the seller leave.
Explain that you're happy to call the police and wait for them.