Working or Looking Like Your Working?

Last week I received a letter from my doctors office reminding me of debt from a previous visit.  The letter was written as very negatively, stating that this has been the third notice and if the debt was not paid within 12 days it would be forwarded to a collection agent and it would interfere with my future visits.  Under normal circumstances the letter would not have bothered me but this particular visit was billed improperly due to its billing department and I had already discussed this with the office and my insurance on two separate occasions.  After hours, I was told the bill should have been covered in full by my insurance outside of my co-pay and that a new statement would be sent out once it had went back through my insurance. Now, I was beginning to receive harassing letters at no fault of my own because the doctors office failed to note my account to make it stop. I then had to contact the office again to address the letter and again was apologized to by billing.  The issue is now settled but the doctor office lack of due diligence was insulting and left a very bad taste in my mouth.