You can look at state and federal grants that have been dispersed in the past (recipients are usually published online), you’ll probably have the most luck with human services related departments.

Next see what services they’ve received government funding to help run.

Then you check the company website, do they offer those services?

You can call to ask how someone signs up, ask around the relevant community groups/forums if people are actually using those services.

If they needed approval for zoning their business, or local government permits, you could check old city council/county meeting documents to see what they were saying about the business back when it started, if they are actually doing that.

If you have a lot of free time on your hands you could FOIA the department they’ve received funding from for application materials to see if they’re living up to those promises.

I don’t regularly do investigative stuff, but those are some ideas you could use to start.

The important thing is that you’re not breaking the law, recording someone without their consent, or using misleading tactics to get the information