The original bill from XXXX XXXX XXXX was for XXXX XXXX for my son. It was sent to my ex-husband, and I was not aware that it existed until it was sent to collections and popped up on my credit report in XXXX of XX/XX/2012 At that time, I contacted the collection agency to find out what this bill was for, as that was the XXXX time that I had been made aware of it. Because no one ever bothered to inform me that the bill existed, they gave me 30 days to pay the bill in full -- which I did -- and then they removed it from my credit report. I thought the issue was resolved at that time. 

Now, XXXX years later, it appears that the original collection agency sold the debt to a different collection agency ( XXXX XXXX XXXX ), who is now attempting to extort money out of me for a bill that I have already paid. They are telling me that I need to pay this bill in full within 30 days if I want it taken off my credit report.