WHat's my next step?

ANYone who receives a phone call from someone attempting to collect a debt should remind them of the federal law that states the following; within five days of their first contact with you, the debt collector must send you a written notice (more commonly referred to as a dunning letter) telling you, how much money you reportedly owe; the name of the creditor to whom the debt is owed, unless you, within thirty days after receipt of the notice, dispute the validity of the debt or any portion thereof, the debt will be assumed valid by the debt collector; and if you dispute the debt in full or in part within that thirty day period, the debt collector will obtain verification of the debt and mail it to the consumer; also, upon your written request within the thirty day period, the debt collector will provide you with the name and address of the original creditor, if different from the current creditor.