The callers are the drug-addicted "card services" scammers, who call us, pretending to be associated with our credit card companies, in an attempt to fool us into giving them our credit card numbers, so they can rip us off. People that have given their card numbers to these junkies have suffered severe financial losses. Beware of these lowlifes, and warn others, before they are cheated!
These creeps call constantly and I have kept a list of the various numbers that "Cardmember Services" use. I have been reporting them for years and you see how well that works. The no-call list is just a joke!