Have you tried any of the other antifungals? Terbinafine, econazole, griseofulvin?
These are all highly effective agents that are often used when otc miconazole does not eliminate the dermatophyte.
Hello? Are you there?
I'll check back a bit later. :-)
I see you are offline. Let me know if you have any follow up questions or want to go over a couple other suggestions.