(although US banks may put PII like "what was your momma's name?" and "where did you go to elementary school?" to actual use, they somehow still haven't gotten around to "can you make a roux?")
Now he is known as cartload-sash-stark-travesty-chastity
> The song's title, "777-9311", was Prince guitarist Dez Dickerson's actual telephone number at the time the song was written. Once the song became a hit, the phone calls started coming in, and Dickerson ended up having to change his phone number.
Now, I just give obviously fake phone numbers like 212-555-1212. Since most of these retail type people are younger, they don't even know what the 555 prefix means or what the significance of the 1212 number was. Instead, they just dutifully enter in the number like a good automaton. If they then try to be "friendly" by addressing you as a the name that comes up with the number, I just nod and smile.
My level of combativeness with their overreaching into privacy is solely dictated by their attitude. Most of them are just fine when you decline to provide the requested data. I've even had some just use whatever pretend account they use. It's only when they get snippy with me that I ramp up.
I just say it's "against my religion." That usually works pretty well.
I've given "none-of-your-business" data to companies that don't need it for a long time, (e.g. my middle name, shockingly, is your domain name, so weird!) but it CAN bite you if you forget your password and they ask for your birthday as proof of who you are.
I get asked my birthday so seldomly that I always forget what my new forever birthday is going to be by the next time I need it.
Phone: Yes
This usually confuses them enough so you can get clear before they recompose themselves.
Never had anyone get real "pushy" though. But I give off "doesn't like to be pushed around" vibes haha.