Has anyone dealt with Stop Recovery Partners debt collection harassment?

I’ve been getting nonstop calls from a company called Stop Recovery Partners, and it’s starting to wear me down. They keep calling several times a day, sometimes leaving messages that sound threatening. I’ve tried telling them to stop, but it doesn’t seem to help. I’ve also noticed they’ve been trying to contact people I know, which feels way over the line.

I found this page that talks about how to stop Stop Recovery Partners’ debt collection harassment: https://protectionforconsumers.com/stop-recovery-partners-debt-collection-harassment/
. It explains some of the laws around debt collectors and what your rights are, but I’m wondering if anyone here has gone through this too.

Has anyone successfully gotten them to stop calling? I’d really like to hear what worked for you and if filing a complaint or sending a cease and desist letter actually made a difference.