You say this guy had your car for two months, but how old is the clear coat?
If he applied the clear coat two months ago I'd say your paint is toast. Even without hardener it should have hardened by now, if it hasn't you're pretty much going to have to start over.
If its less than a week old, I'd say you might have a chance of it hardening up and being able to wetsand it at some point. Realistically though, the paint shouldn't be that soft if its any more than 3-5 days old. And, even if it does harden, we're obviously not dealing with a great paint job. The clear may not be thick enough to get rid of the buffing marks without breaking through the clear.