[US] I got a call saying a claim was being filed against me

They have called me repeatedly and left messages saying I needed to calm them about a claim. They started threatening to call my work. They started calling my mom said they were going to come to her house and called me saying they were going to come to my work to locate me. I finally called back and they said a claim was being failed with my county unless I could pay my debt back with [company for amount] which was legit. They knew my address and my last 4 of my social. Never asked for my full social. I stupidly made a payment arrangement and now looking into it, it’s not the company that owns my debt and I don’t even think they told me what company. Just a 3rd party. I feel so stupid but they were threatening charges against me. I feel like I know better. I disputed the charge with my bank and contacted the actually debtor. Help what can I do?? I’m so scared.