Just a thought, if you're trying to contact Mike directly, he may be on vacation somewhere (maybe a cycle trip?) and hasn't seen your attempts at contact. Maybe.....but still someone should have been responsing to you. As suggested above, I'd call the bike shop and talk only to the manager (ask for Mike...)
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If you have a problem, if no one else can help, and if you can find them, maybe you can hire the A-Team.