When you call about something like this, they’ll try to give you some general advice and refer you to a law firm.
Firstly, they can't exist most of the time you can't actually call a lawyer and talk to them - you get their office and their "job" is to gatekeep that lawyer from making any discussions with anyone who isn't represented or paid for a consultation.
Secondly, once you do get into contact with them you'll get a blank stare or phone silence. This is not how most lawyers view pro-bono work. Most of them have a very small quota of pro-bono work to be done and that's it. They get assigned a case by their firm or go and accept a few a year from the state and they're done with it. The idea that an altruistic lawyer exists out there ready to do free and unpaid work is virtually non-existent today.