I received a notice that this company has had trou...

I received a notice that this company has had trouble billing my insurance - yet the number they have for me is correct. I have called the number on the letter four times. Each time I was given the option of leaving a message requesting a call back. I did this and have not received a call back so far. Given the other reviews, I doubt I will receive a call back ever. I am going to ask my doctor to use another company.