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How to get rid of someone else's debt collector?
Suing is a legitimate option as well as screening your calls but here's another idea which has personally worked and relates to the collections I did for awhile.  Talk with the collector.  Outstanding debt gets sold many times and each time a new collector gets their hands on an account they do their due diligence which means calling every single number multiple times.  Collectors a looking for consumers who actively evade collections calls for years. My recommendation is to use logic and explain the situation.  Give your first name and describe when you received the phone number and then ask a simple question.  When in the last 3 1/2 years have you or any collector had a successful hit from this number.  They'll respond never in 3 1/2 years.  The collector notes the account for themselves and future collectors.  Debt collectors are about about making money, not wasting time and they do review all notes pertaining to an account.  Will it work?  Maybe not but hopefully it will stop the calls with a short conversation.  Good luck.