If you have a problem with an European school, you have the same zero chance of getting your money back from them.
That's not true I am afraid in quite a lot of country's, UK being one of them if they are still trading or you paid by Credit card.
It will cost you less than hundred pounds which is recoverable through the small claims court.
And the main point being the school can't fling you out of the country by cancelling your visa just to get rid of the problem if you have a EU passport.
The whole thing even if you live in London is a huge pain in the backside especially if you have a job and have to take a day off to visit the embassy.