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Debt collector has wrong person and is contacting my employer
Don't waste your time threatening legal action or screwing around with certified mail. If they're contacting your employer to garnish your wages they probably already have a summary judgment against you for failing to appear at a court date you didn't know about.  Your employer might have had your back but these guys will continue to try to locate your assets and attempt garnishment until someone does accept their claim and hands over your bank account.  Contact a bankruptcy attorney immediately (they are most experienced with dealing with debt collectors and related issues). Consultations are generally free.