How can you stop harrassing collection calls when you don't owe the debt?

Kentucky does not have it's own version of debt collection laws, per se... but any resident is still covered by the federal version of the Federal Debt Collection Practices Act and the Fair Credit Reporting Act.  Your first step under these federal rules is to dispute the amount of the debt.  Do this in writing and send it by certified mail so that you will have proof that it was sent and that you did dispute the debt.  They are required to cease collection activity while the account is in dispute.  Document any collection efforts they make while the account is in dispute.  They cannot resume collection activities until they verify that it is a valid debt.  If they present you with verification, you can present them counter information that the debt is (a) either not your debt or (b) the debt has been paid. 

You can also request that they cease all communications with you regarding the collection of this account.  If the company still attempts to collect on a debt that you have shown them is not due, then you should consult with a consumer law attorney.  Their first step should be to send a formal letter on your behalf instructing them to cease collection efforts on an invalid debt.  If they still continue, then he can file a suit on your behalf for violations of either of the statutes mentioned above.  You can also file a complaint with your state's attorney general.  They have a form that you can download and submit.  They make it clear that they cannot seek damages on your behalf, but it's still worth the effort to submit the complaint because once they receive enough negative information regarding a company, they will have the grounds they need to file a broader suit.  To collect your own damages, however, you would still need to file your own complaint.