The carrier is NUSO, which is quite notorious in the industry. You can look up their reviews. They seem to enable illegal foreign robocallers and scammers and turn a blind eye to such behaviors. They are owned by Brightlink that was issued Cease and Desist Notices for such misconduct.
You should complain to them: [email protected], [email protected], [email protected], [email protected]
NUSO has quite the “history”: Cancer camp Lajuly - Scams - Scammer Info