I also stand by the old piece of advice that was given to me before I embarked on my initial training.
Never ever pay large sums over to a training organisation before you begin.
Problem is, a few years ago people were stung when a lot of the smaller schools went into liquidation and left them badly out of pocket.
Another thing that can happen is the service that you receive from these places can be really shoddy, the truth only comes out once you've actually started flying with them, they obviously sell themselves to you in the beginning, but once they have your money it can get a little nasty trying to get it back!(as you are finding out)
Now in your current situation, I feel certain you will get your money back, like others have said, just get a bit aggressive with them and threaten to take it further, they'll probably back down pretty quickly as they certainly don't want any bad press!
Good luck and let us know how you get on!
Ant