I have received XXXX notices from this company called Debt Recovery SolutionsLLC. 

I was informed through the letter that they had bought my account with a bill from XXXX with a bill of some amount of money. i didnt take action. They sent me another letter later that is shown through the attachment. They asked me for about {$340.00}. I called them and before they asked me to say my last XXXX digits of ssn, they said my last XXXX digits and asked me if it was correct. After i asked a few questions i hung up and started to have suspicion because of few reasons. 

1. I was a XXXX customer but right now when i received the letter i am a XXXX customer and i had payed off the rest of the bill. 

2. It was weird they knew my last XXXX digits of ssn even before i said it. 

3. I had businees with XXXX NOT XXXX. I didnt ever owe anything to that company. 

4. When i called them and told them that i would report them they threatened me about my credit score.