I would usually give the seller the benefit of the doubt, but in this case he seems to be stringing you along needlessly. Drawing from personal experiences, I've actually been scammed like this before. Using EMT to pay a total stranger can be extremely risky, because simply there is no recourse.

I would wait a couple more days, see what he has to say as you can't lie forever right? eventually he'll run out of good explanations to give you.

If you have any bits of his personal contact information I would hold on to those just in case.

Regardless, keep on posting your convos with him. It'll certainly help us decipher whether or not he's guilty of fraud.