Should we call corp office on dog trainer? Help!?

My Mom got her dog trained at Petsmart. She went through puppy class and graduated. Upon grad, the trainer asked if she wanted to repeat the class or be promoted to intermediate. My Mom chose to sign up for interm because the trainer said she graduated. Duh! We then decided to bring our 3 year old terrier to training who had been through Petsmart puppy class but never graduated because of the trainer at the other store's incompetency and some issues. I worked with him myself. Both of them last night were hungry and bored and didn't cooperate. Suddenly, the trainer told us to get out and that both dogs had to go back to puppy class. When we tried to get a refund, he jumped out of the training room and started telling the manager not to give a refund and that we needed to wait and take the class in a few months and they will hold our money on file with our receipt. I think he had no right to tell my Mom and the manager what to do and if we wanted a refund, we could have gotten it (Petsmart's policy). Should we just go back to that trainer (both dogs do need training, but NOT from him!) or call corporate office and fuss?