[VoiceOps] Scam Caller - course of action for service provider?

Hey All, We have a customer who came on board and used our hosted phone service. They made it through our "know your customer process" by misrepresenting themselves. They were actually referred by another customer. 24 hours into their service with us one of our carriers flagged their calls. I started digging into their traffic and learned they are running a scam to convince elderly folks to give up their credit card information. It makes me sick to think this was on my network. I have obviously terminated their service. I would like to take this to the authorities. I have call recordings and KYC information. Thoughts on where to start? Chris