FirstSource Advantage, LLC Debt Collection Complaint

FirstSource Advantage, LLC Debt collection department,

Medical Cont'd attempts collect debt not owed Debt is not mine

I received collection in my credit report. I have insurance with unitedhealthcare which covers 100 %. Before my visit they told me that the insurance will cover everything. After my visit to the hospital, I received the bill, I contacted the insurance many times, they did not want to fix the problem. They told me to wait. I was waiting. Then I received the collection in my account from the creditorCreditor Contact DetailsFIRSTSOURCE ADVANTAGE - - -, - ( - ) - - -, - AgencyFIRSTSOURCEamount $ -Could you please let me know how to fix this issue? Thank you- --mail --