Same issue, no mini Miranda, clear violation of FDCPA. I will not be dealing with these people.

I received a voice-mail from some guy also trying to reach someone who he thought he could reach at my number.  The call was a strong threat from a bill collector.

This the same caller that uses the number 337-376-0532 who also uses this number 702-989-8720. This "person" is trying to collect on a debt that's more than 5 years old (which is not longer collectible in per State of Nevada law) and is in violation of FDCPA (The Fair Debt Collection Practices Act, Pub. L. 95-109; 91 Stat. 874, codified as 15 U.S.C. § 1692 ?1692p) law. This b*****d called family members and didn't properly identify himself and pulled a scam move to try to mine information and tried to scare/bully my family. DO NOT PUT UP WITH THIS GUYS ILLEGAL B***S***.
As nicely put by another victim of the other number, "Any callers who refuse to identify themselves or mail proof of any alleged debt and their legal right to collect said debt, are owed nothing, per the FDCPA.  Report the callers to the FTC, FBI, Dept of Justice and your state's Attorney General.  Threats of legal action are also a violation of the FDCPA."

Calls constantly.  Never leaves a message