This is the first time I've posted here in years, but this really caught my eye. Shocked to see Mark's name and "scammer" in the same sentence, I felt compelled to pipe in.
While I don't know Mark personally (as in, I haven't met him in person), I've had numerous business transactions with him in the past. I can assure you that he always responded as promptly as possible. Occasionally he'd be held up by a backlog of work or something personal that needed to be taken care of, however, he always came through.
If he's not responded as quickly as you'd like, there's bound to be a very good reason for it.
As Jerome pointed out, Mark hasn't felt well. I don't know any details whatsoever, but since this has been the case for some time, there's always the possibility that it could be serious. Please keep in mind that this is family-run business and not a corporate enterprise.
Perhaps you might wish to take this into consideration, show some fellow feeling & continue being patient just a little while longer? I seriously doubt that it would take too much longer for your request to be honored.
~Karen