As Grifter stated there are state and Federal laws these collectors must adhere to. They cannot disclose any information regarding the case unless they confirm they are speaking to the correct person and they cannot leave a voicemail with information regarding the alleged debt. What Grifter left out is the debt collector is required by the same state and Federal laws to leave their name, company name and number on these voicemails. I just received a call from someone at this company and they failed to identify who they are with. I only figured it out by doing an internet search of the phone number. I don't return calls to people or companies unless they identify themselves properly and have a legitimate reason to contact me. In this case they do not. I don't have past due debt.