I am so glad you asked this question. My answer is No, please don't send anything like this, it barely makes sense. Fake legalese like this is just so unnecessary.
Just write clearly in English.
Just say "I am requesting validation of the debt" and include any account numbers (there are often more than one account number, one from original and another from collector or debt buyer). Maybe send a photocopy of the notice sent to you.
Then send it certified mail, return receipt requested.
Unfortunately, you do not even have a right to insist on "competent evidence" or "copies of any papers". Also, why do you want them to go hunt up competent evidence? Not that your letter would make them do this.
The above statements are provided for general information purposes only and are not intended as legal advice or advice of any sort for a specific case or legal matter. If you do not have a signed attorney-client fee agreement with the Hill Country Consumer Law ("the Firm"), then until such written fee agreement is provided and signed by both a prospective client and attorney for a particular case, neither Ms. Kleinpeter nor the Firm will represent you nor will they be your attorney in any matter and you remain responsible for retaining your own attorney and for compliance with any and all deadlines and for any statutes of limitations that may pertain to potential claims.
I agree with Attorney Amy. There is no special language needed, and usually less is best. As she says, use plain ordinary English, and one or two sentences is sufficient.
This is general legal information, not intended to apply to your specific case. And I may not be licensed to practice in your particular state. Under Federal Law, I am a debt relief agent.
I agree with my colleague. Write a simple letter, in plain English, asking for validation of the debt. Send it certified mail with return receipt requested.
My answer is for only informational purposes and is not legal advice. I am licensed to practice law in Oregon and I recommend contacting a local attorney for the best help with your legal questions.