I have to wonder if there is any relationship to 305-304-9999, also a cell-phone, also "Cardholder Services" with 14 pages of complaints. Yes, I know, West Coast-East Coast, 503-305, purely coincidence and I am paranoid.
Just now received a call from this (spoofed) number. I suspected that it was the "lower your credit card rates" scam and didn't answer it. My goodness, by not answering I missed my 5,326th "final notice" to lower my credit card rates. Apparently, this caller ID number that is being used is very new as there are only a few complaints thus far and the first only about 3 hours ago. I think they (whoever is calling) change the calling number quite frequently now so that we can't rack up that many complaints against a particular number on these websites.