See my list of 480 JERKS below that robocall, call repeatedly, call and hang up on my answering machine or me.  This 480-320-2677 is part of a group of numbers that call for credit cards.  Here is the group and they are all hang up calls.

480-320-2628    UNKNOWN hung up on ans mach
480-320-2634    UNKNOWN hung up on and mach CC Processing
480-320-2635    UNKNOWN hung up on ans mach
480-320-2677    UNKNOWN hung up on ans mach
480-320-2689    UNKNOWN hung up on ans mach

Add these to your list, too:

480-320-2613
480-320-2626
480-320-2593