on XXXX XXXX 2015 I found out that MEDICAL DATA SYSTEMS was reporting negative information on my Credit Report and on XXXX XXXX I sent a letter toMEDICAL DATA SYSTEMSDBA/ MEDICAL REVENUE SERVICEXXXX XXXX XXXX XXXX , FL XXXXDisputing this information Informing them that this account was being Disputed under USC 1692g Sec. 809 ( b ) they received my first Letter on XXXX XXXX 2015 ( usps.com - Tracking Number : XXXX ) I Received a Response Letter dated XX/XX/2015in this letter they claim they can not locate the account with the information that I provided in my first letter which is the same information they are reporting to the credit bureaus. 
I sent them a second letter on XXXX XXXX 2015 which they received on XXXX XXXX 2015 ( usps.com : Tracking Number : XXXX ) informing them that they were in violation of USC 1692g it has now been more than 30 days which federal law requires for a collection agency to validate an account