If you are receiving collection calls and want them to stop, I suggest visiting privacyrights.org. there they have all sorts of suggestions and ways to combat harassing phone calls.
Washington Mutual
1301 Second Avenue
Seattle, WA 98101
Dear Sir or Madam:
Pursuant to The Fair Debt Collection Practices Act as amended by Pub. L. 109-351, §§ 801-02, 120 Stat. 1966 (2006)
Section § 805.c, § 806.5, § 806.6, and § 808.5
Please cease all telephone contact with any number associated with me from ALL of your numbers regardless of the alias under which you have registered said number. The logged numbers include but are not limited to
We've been getting calls from this number for a few days. We aren't WAMU customers. I called the number back and it asked me for my full credit card number, I entered something random and it asked me for a full SSN. Sounded like a scam. I told the guy that eventually answered as much, got nowhere.
I've had 3 calls from this number today. I used to have a WaMu account, but closed it months ago. I don't owe them a thing. and I sure as heck didn't give them my number. so I don't know how they got it, or why they're calling.