Early Termination

I called into the HughesNet service on or about Jan. 30, 2019.  I spoke with the representative and explained to him exactly what I needed the service for.  My grandson does online schooling.  The representative assured me that this service would work for my grandson.  The representative stated that it would ge a good idea, because if it isn't working for him, that I could cancel at anytime.  I took him for his word and had HughesNet install their equipment.  After less than 30 days my grandson complained that it was very slow and not doing what he needed.  I called in to HughesNet today (3-4-19), to explain to the representative that it is not working for my grandson and I needed to cancel the service.  She stated that it would be a $400.00 fee if I cancelled today.  Let them check and see what they could do different before I cancelled.  I stated that I just wanted to cancel the service, and why would I be charged $400.00 just to cancel for a months service.  She stated that I needed to go back and look at my contract.  I told her that the representative stated that there was no commitment and I could cancel at anytime, because he understood that it was for the online schooling.  So its not working for that purpose and I want to cancel.  And HughesNes would charge me an extra $300.00 for the equipment if not returned.  But the $400.00 for cancelling, I'm not getting.  When I was told there was no commitment.