Payment was made to XXXX XXXX XXXX XXXX have receipt dated XXXX XXXX, 2015 ). 
As I paid in full, at one time, XXXX gave me a credit of 5 % on the total bill. XXXX from XXXX to XXXX XXXX Received notice from collection services XXXX weeks later asking for payment of the full amount. 
I contacted collection agency with copies of receipt, and they sent me another collection notice a month later, when I again sent them a copy of my paid in full receipt. 
I now have a major black mark on my credit report. I have attached my billing summary XXXX no balance due ) from XXXX, and have also included my receipt from the initial payment on XXXX XXXX.