Someone has created an account using my name and phone # and is soliciting information from financial institutions and car companies. How do I stop them?

Someone has created an account using my name and phone # and is soliciting information from financial institutions and car companies.  How do I stop them?  I am afraid they are attempting some kind of identity theft and are trying to get additional information.  I have received countless phone calls today from various individuals saying I sent them on-line requests which I did not.  I was told they came from an account *** Email address is removed for privacy *** with my phone# attached.  I did not set up this account.