Real name for the folks at home: East Metro Recovery Services. The real question is, would those threats and obfuscations offend the FTC? They may be legally actionable. Send a cease-comm notice via USPS Certified with card, unless the alleged debt is within statute of limitations, in which case validation is a better move. The FTC and many consumer watchdogs explain how to draft the appropriate letters.
If you are receiving repeated, misdirected, and/or abusive calls from a third party debt collector, you may find relief in the provisions of the FDCPA, the federal law which regulates collector behavior. Learn your rights at FTC-dot-gov. See also your state laws for additional support.