Had lab work done at doctors office. XXXX XXXX lab did not bill ins co. I have complete coverage. Sent my bills to incorrect address. Never received bills. They did not attempt to get right address. Put bill into collection. American Medical Collections never contacted me at my correct address but attached this debt to my credit report which was flawless. XXXX Notified them the debt was in error but the collection agency will not take it off my credit report for 45 days. This has significantly lowered my score. XXXX will not send me a letter that they made error sending to Collections. 
