Don't be passive. Honestly I would send them another DV specifically requesting what you are asking for:
What the money you say I owe is for; Explain and show me how you calculated what you say I owe; Provide me with copies of any papers that show I agreed to pay what you say I owe; Provide a verification or copy of any judgment if applicable; Identify the original creditor; Prove the Statute of Limitations has not expired on this account Show me that you are licensed to collect in my state Provide me with your license numbers and Registered Agent CMRRR it, too. It's your credit report, don't mess with it.
And yea, it can get worse. Judgments on your record are worse than collections!
Good luck.