I called the number today as they have called 3 times this morning already. Their office was closed, but had an option to "opt out" of future calls. Let's see if it works
Going through the replies regarding crank calls from 213-289-5589 phone no. , some basic information are : 213-289-5589 is a Landline Number / Location is Los Angeles, CA & Zip is 90071.
These are the basic details i got from http://www.namefromphone.com