Did some poking around on this one... Research indicates the number is from a Mokolo Inc http://molokoinc.com/contact-us/ which is dairy equipment company. The number is listed as a contact for their president, Eileen McKillop. The company's site is dubious. When you google the address, it is for a large home in a residential neighborhood
http://maps.google.com/maps?q=20128+27th+Ave+ ... ved=0CDEQ8gEwAA
Eileen McKillop is also the name of an attorney specializing in construction, appellate practice, insurance surety, and construction defect with Oles Morrison, a Seattle, WA law firm http://www.oles.com/professionals/attorney-bio/eileen-i-mckillop; who's public Facebook profile has her living in the same town as the location of Mokolo Inc.
I gave the number a call back, and it sounds (almost) like a woman's cell phone. As we have no credit cards or debt, I couldn't imagine being contacted by a collection agency, let alone a dairy products company, or a construction litigator! This one has me stumped! The fact that all calls were made today too is odd... Nothing adding up, and none of it makes sense. As such, I'm going to assume it was a misdial...