I have some medical bills from this year that I paid off. now out of no where their saying I owe 300 dollars, so I fax them the proof that I paid and they still won't do anyhting. I called the medical place to see if I missed a payment and they said no. So my question is if the collection agencies they that its on my credit report as bad can they do this????? P.S I just looked at my credit report and there is no medical bills on there.