This company calls numbers on the national do not call registry in violation of the Telephone Consumer Protection Act. They refuse to provide a phone number or a physical address when asked as required by the TCPA. They claim to be a collection agency looking for people to collect on, but refuse to provide any basic information while demanding to know how many people owe you money and how much they owe... This is quite clearly a scam, especially since they refuse to provide basic contact information as any legitimate company gladly would. Do not provide this scammer with any information.