Re Your query re Licence etc
The Training school have no legal right to keep property which is in your name Its like someone taking your Passport
I would report them to the Local Police and tell them your documents have been stolen and you know who are the thief s
Unless you have signed an agreement to state they can do this they have NO Legal right to keep your property without a court order or similar for non payment
Dont let them walk over u they are ****s by the sound of it
Good Luck