I've had the worst experience

I've had a horrible experience during my entire pregnancy. The very first time I had called requesting the list of network specialists and they gave me an incorrect list! Who is supposed to take responsibility now that I went to the wrong doctor according to them I did not get authorisation because I did not go to the network specialists which they gave me the wrong list in the first place, I basically pay but they are not willing to pay for a single consultation because of their mistake. They take so long to answer their calls, I don't receive any relevant emails, I am always calling to follow up on the emails I'm supposed to receive.