You can also recover your money if you paid by credit card and it comes with some kind of coverage for this type of situation.1. Registered letter/AR card, paper mail, requesting refund, copy to file, copy to BBB in Tulsa.
2. Cover letter to BBB in Tulsa, with (1) as attachment, paper mail.
Or do as Peter said. A long time ago, I ordered a Twin Reverb from a music shop in the States; it took me 6 months to get it and they moved only when I send them an "official letter".