Tell them to pound sand. I don't give my number to anyone-Had a battle with SBC over "lifeline" rates because they wanted a copy of my most recent tas return. I told her that is between me, my CPA, and the IRS. NO one else gets a thing off that paperwork. I have to almost triple my phone basic charge, so there goes another bite into my soc sec of about $900/mo, but I don't let that info out.
TOO many people are asking for that info on a cavalier basis. They seem to think they are ENTITLED to have that info. I tell them to pound sand.
i used to treat my ssn like a state secret, then a friend emailed mine to me along with all kinds of past address info and asked if it was correct. he had gotten it off of a 75$/mo background check site with my name and city/state.
there is no data privacy now.