I do not have any responsibility for the debt they are trying to collect and I request that this unknown debt be removed from my credit files immediately. 
Furthermore, if they have good reason to believe that I am responsible for this debt, then I want them to mail me proof that make them believe that. In addition, I also request they stop all other communication with me and to my home address, and record that I dispute having any obligation for this debt to all XXXX major credit bureau 's. If they report it to a credit bureau XXXX or have already done so ), then they must report that the debt is being disputed.