XX/XX/2021 I attempted to collected information on XXXX accounts with " National credit system Inc " that posted on my XXXX XXXX. I called in at XXXX cst and Spoke with an agent " XXXX XXXX XXXX who I requested a Debt validation letter to be sent to me he refused and began to get agressive and irate and yell and tell me that I will not get a letter unless the debt was paid. I then informed him that tha was illegal and that I have the right to request for a letter as stated in the FCRA he continued to yell and cut me off and not let me speak then hung up on me. I have reported him to his supervisor by leaving a voicemail at XXXX cst as well as requesting for a follow up. This behavior from the XXXX XXXX  who represents the company makes it difficult for me to get my credit score corrected and has affected me in more ways physically and emotionally and nobody should suffer or have to deal with difficulties when trying to correct or solve their credit debt.