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How do I deal with a mistaken attempt to collect a debt from me that is owed by someone else?
I can only speak for germany/europe. Inkasso companies/lawyer would write a letter with a bill, those letters have register numbers. If in doubt, one would call the company, ask who is the debtor/what is the origin of the bill. I certainly would not react on a phone call. However, if an official entity or lawyer is contacting you, you have to take action asap, at least calling them.