There were two unanswered calls from this number this morning (Oct 24, 2015) neither of which left voicemail when the call went unanswered. Then I checked the number here, and saw other complaints, so I added the number to the "spam" heap on my phone--i.e., I give them each the name "spam" and a silent ringtone.
Set your phone up to block private callers and mystery numbers. Who's calling you likely doesn't either know, or care about any lists. They call who answers.
'Heather' called from Credit Card Services...press 1 to lower your interest rates; got a far-eastern person with barely intelligle English skills who had the first few numbers of my card, but kept pressing for other information. I hung up on them!