I just hang up on the phone with a telemarketer of a credit card company. For someone like me who is trying to manage her finances and terminate her subscription with all cards save one (for emergency purposes), that call was just the least one that I need.
I just found www.phonenumberinvestigator.com. A handy site for those who would like to look into those unknown phone numbers registering in your phone’s screen. Now I know what calls I should take and what I could just ignore.