This is a Washington Mutual (WaMu) collections department number.  I am currently going through a debt settlement program, so I get calls from them all the time.  They use some kind of autodialer, and use a different number each time.  Here are all the numbers I have for WaMu:

412-595-9025
703-269-0648
763-852-0014
201-267-9017
321-549-3042
509-481-9106
626-534-0250
303-481-0027
623-476-0009
602-358-0120
619-471-0037
210-247-0026
305-384-2104
817-256-9617

They are scum.  The best way to handle them is to remain calm and not let them rattle you, because that is what they want.  Good luck everyone!