After receiving MANY phone calls from 425-427-7879 that sounded like fax machine, I called the number back. I actually spoke to a very polite man who told me it was Costco.com It is Costco.com's auto fax trying to fax confirmation of my order.
I recieved another call, and just forwarded it to the fax machine.
The auto system faxed through what (it) wanted, and I did not receive any other calls!
Give it a try if you can!!!