<prompt> Human: Im dealing with a really aggressive debt collector. First of all, Im in Oklahoma, hes in California, and as purchased zombie CC debt, claims to be with a lawfirm. The first few times he called, my phone sent it straight to v-mail because he was using caller ID tricks or called from unknown numbers, and my phone automatically blocks those calls. This week hes started calling my dads cell phone and leaving the same messages. Since I now have a real number to call, I called him back, and its just this one guy--Chad--and without verifying my identity or even asking who I was, he tells me the debt is from a 500 no credit history necessary card I havent used since over 10 years ago. I told him I am certain the debt had expired, but he said it hadnt, and that they were prepared to hire and out of state lawyer to proceed with paper filing. I kind of laughed and said well, if you feel like chasing zombie debt, I guess... and he said OK ILL NOTE ON THE ACCOUNT YOU WERE UNCOOPERATIVE. Then hung up on me. I tried to tell him hang on, but he hung up anyway. I called back immediately, but he wouldnt answer, so I left a voicemail saying he does not have permission to call either my cell phone and certainly not my dads cell phone since hes not even a part of this thing. Then the dickhead calls me back and leaves another voicemail that its urgent I call him back again today. WTF, you hung up on me. And I said not to call my cell. I am afraid to call because the first time I did he said he was making a note of contact since they are allowed one contact and this counts as it, whatever that means, and 2, hes obviously fishing for info. I know I should ask for proof in writing of the debt, but hell ask for a confirmation address, and as of right now he doesnt have my actual address. Plus I dont want to confirm anything to this knucklehead. Do I just let him huff and blow and see if its legit, or do I call him back and say X or Y? How do I get him off my back? I know the debt has expired, unless theres a way to collect on a 10 year old credit card debt in a state with 5 year SOL.  <response>: This sounds like you might want to get a lawyer to threaten these guys with a lawsuit. Calling you multiple times, not validating the debt, calling your dads number, all of those things can be illegal and actually get a payday for you. Ill let those with more experience chime in though Do start recording when and where he has called though. 