Commonwealth through Amax Auto insurance

I recently bought a car and wanted to get an insurance for it. I called amax and they gave me an offer of 600 dollars for 6 months. I met my friend after that and he told me to cancel it because it was too expensive and I did cancel it but they charged me 200 dollars for just 1 hr even though i didn't complete my forms to actually get on the plan. They said we will cancel it but your refund will be processed by commonwealth insurance. Today I received a check of the refund with 200 dollars less than the paid amount. Is there anyway I can get some of it back?