I hate to say it but..
Your contract is with the school company not with the person.
If the company has been wound up you can only be added to the list of people owed. And once the assets have been sold you get a percentage of what's owed.
Chasing AT won't get you anywhere and will only cost you money and get you even more hacked off.
Its standard practise to fob people off until the company files bankruptcy because the owners know as soon as they have filed that's them in the clear and its in the hands of the administrators and not there problem.
If you have payed by credit card you may be able to apply to get some money back through the CC protection schemes (I don't know how it works with Finnish CC's) . But if you have payed by wire transfer you are stuffed.
This is the reason why on here we say time and time again never pay up front for training what ever the discount.