Called, left no message, Caller ID was Seattle, WA

Called, left no message, Caller ID was Seattle, WA

Same call for me today, called, nobody was there..

CID Info:
WASHINGTON  206-494-5600  12:36  9/12

Recorded message - "Rachel" from "Cardmember Services" offering to lower my credit card interest. I pressed '9' to speak to a rep. I asked rep to put # on their DNC list & ended call.
THEN THEY CALLED BACK 8 TIMES WITHIN THE NEXT 20 MIN. (CID read: UNKNOWN  0000). Each time a rep w/ Indian accent & bad phone connection! tried to get me to give card info; each time I told them to put me on their DNC list. During this period they also left a suggestive voicemail, presumably as I was on the phone w/ them.  I reported to donotcall.gov but a fat lotta good that's gonna do.

This number called my aunt's home phone 2 times and no one was there. When she called the number back they hung up on her. Does anyone know what this number wants?