I placed an order from them yesterday afternoon. Got the tracking number this morning--usps doesn't show that they have received the package yet, but the label was printed this am and 4noggins claims it shipped, and it's pretty common for USPS tracking to be a few hours late getting the status updated. I don't know what is up with your order getting delayed (or not being able to get them on the phone), but they still *seem* to be shipping.
If you paid with a credit card, and if it never ships, you should be able to contest the charge.
But I'd also give it another day or two before getting too concerned. The delay (and inability to get them on the phone) might leave a bad taste in my mouth, but I wouldn't panic that my money is gone forever. I can dream up a million innocent reasons a particular order might get delayed a couple of days.