You cannot call this number back.  You get a disconnected notice.  Isn't that illegal?

415 230-2021 also uses 415-690-1069 They are called 1st National Collection Bureau, they are a Nevada based group that uses many different ph#'s to call from.  They prompt you to press #2 if you are not the person they are looking for, however that WILL NOT stop them from calling.  You actually have to call them back and tell them to remove your ph #.  Also record the call tell them you've recorded the call (if your state is a 2 party state)  and remind them that they can be sued for $500 each time they continue to harass you & DOCUMENT the calls you get

415-690-1069 called and when they got no answer they hung up.  I blocked caller with  *67 and called back.  It is National Collection Bureau. I owe nobody any debts so it has to be somebody from long ago who had this number.