If you do not owe any debts, then they apparently have a wrong number.  File a complaint with your state Office of Attorney General, Consumer Protection to get the calls stopped.  If you're not sure if you owe a debt, check your credit reports to see if a debt appears on there.  Make sure you recognize it and it belongs to you.  If you find no debts that would result in collection calls, file the complaint with your state Office of Attorney General.   www.annualcreditreport.com is the only truly free annual credit report.  You can go on there once a year and get copies of all 3 of the national credit reports.