Dear Sir or Madam : I am writting to you because on XXXX XXXX, 2015, I did received a letter from Portafolio Recovery Associates LLC., Sender is : XXXX XXXX XXXX XXXX XXXX , XXXX, XXXXIn this letter he or they is/are claiming that I have a debt and they do not disclose the name of the person or company making the claim. 
I certainly can submit proof that I never have incur in any debt, nor done or signed for any kind of loans or credit cards or buy something or used a service to pay later, since all my life I have used cash to pay for any product or service I wanted. 
I am a retired senior and I do not acknowledge any kind of debt. 
Please, I will greatly appreciate it if you please get in contact with me via letter or phone and let me know of how to respond to this kind of scam, because this is a fraudulent debt collector. This person or company is requesting that I contact them, but I have not done so, since I am afraid what tactics he or they may use in order to implicate me in their nasty claims. 
For your attention and prompt replay to this matter, many thanks in advance. 

Sincerely, XXXX XXXX.