Wow, that looks like an aluminum roof beam exposed. It looks like someone was on the roof and the weight sheared it all the way across.
If so it should have leaked like crazy. Just shootin in the dark but the guy caulking may have stepped up there and split the roof.
Either way, the dealer should "in good faith" return your deposit. There is no way he should keep your deposit. Be persistent and dont let up. Asked to talk to the owner or whomever it takes.
Let him know that you will take whatever measures need be to get your money back, BBB, Good Sams, etc.. Surely, upon further inspection they will see the light.
In my younger days I would have informed the manager that he might want to make an appt. with his dentist to replace missing teeth in his near future should he continue to refuse a refund!!! LOL
Hope you get it worked out.
