<prompt> Human: I went to the doctor awesome I know. I left and later I got a bill in the mail. I mailed the doctor a check for the bill. They cashed the check. A few months later I got a letter from a collection agency saying I owe them the exact same amount I had already paid the doctor. I called the agency and said I paid the bill and have proof. They said they would contact the office and get back to me if needed. They never got back to me. Now about 2 months after that I just got a ding on my credit report for an unpaid bill that was sent to collections.Is there anything I can do about this?  <response>: Dispute it with the credit agencies. 