My passenger window does not drop down when the door opens?

My passenger window does not drop down when the door opens like it should and the lock doesn't work on it either. I took it to a mechanic shop I will not put on blast right now, and they charged me $580.00 for the labor to do diagnostic on it. They claim it took 6 hours of labor to do the diagnostic but the $580.00 didn't cover fixing it. So, it is still broken and now they want $731.84 to fix it and $441.84 is for labor. I am a girl, so I feel I am being taken advantage of due to my lack of knowledge of cars. They charged me $1,926.11 with $1,270.00 of it being for labor. They diagnosed my door lock for $580.00, said they replaced a lower engine shield (which is not done, and I still do not have one) for $303.03, and said they replaced my wheel housing lining (which they did not do, and I don't have one on my car still) for $315.04. Now they won't answer my calls and I am so frustrated, but I don't know how much it should cost for these things or what I can do about them not doing what I paid for! Also, my car keeps shutting off when the RPMS drop, what could that be? Thank you for your time and I look forward to talking with you!