Jennifer,
I can understand your frustration.I am fairly well experienced and became frustrated early on. These guys here at the Forum are willing to help and are experienced with many of the problems that you are experiencing. They helped me "over the hump", keep on you will come to love your Coach and when you go somewhere you will hear "it's a Newell".
If they Load Checked the Batteries and all tested good then most likely your issue would be the Cable Connections and or the AC Shore Battery Charger. If your's is an Original Charger it is a good time to up-grade it. The Battery Chargers are so much better today even better than the Charging Function of the HEART or TRACE Power Inverters. Here is a link to Battery Charging;
http://www.westmarine.com/webapp/wcs...ryCharging.htm