Hi, I was contacted by phone on XX/XX/XXXX and was told by an agent of XXXX XXXX ( XXXX Texas ) that I owed in excess of {$22000.00} as a result of a debt from a Chase credit card before XX/XX/XXXX. He said that if I did n't pay they would file a XXXX. He said he did n't have to send me written information and when I refused to accept this debt he said " enjoy the IRS '' and hung up. I called back a couple of times and they said they did n't have to write me with the information about the debt and hung up on me. I sent a certified mail return receipt letter ( XXXX ) of dispute on XX/XX/XXXX to the P0 box indicated on their website. I see the letter was not picked up and is being returned now. I sent 3 more letters today ( XX/XX/XXXX ) -- XXXX XXXX to their street address, a certified-only to their street address and one certified-only to the PO box address. I informed them in the letter that all my debts were discharged by Title XXXX bankruptcy XX/XX/XXXX, I have had no collection activity in the last 10 years, and there are no negative records on my credit reports that could be confused with a debt like this. I have not changed my address in the last 10 years so that could not cause confusion. I am concerned that they will try to create a paper trail or a basis to revive a non-existent or discharged debt and use the IRS XXXX to the same end. Please help.