Do you have his address?
Don't give them to me but do you have them?
Is he a dealer or a private seller?
OK. Well, you can always issue against him at his work address. That is perfectly valid service. It is always better to issue at a home address overall but if he won’t give you his address then work will have to do.
You are right. This is just plain misrepresentation and you are entitled to recover.
However, whatever the law is on the point the fact remains that he is refusing to refund you.
In those circumstances your only option is to sue or to write the money off. Since I imagine the latter option is not attractive you are left with suing at the small claims court.
You can issue here
Although it would be better to send him a letter before action first though.
Can I clarify anything for you?