I am a Hungarian lawyer and if you wish, I can assist you in contacting the university and facilitating the refund for you. (Honestly, I do not understand why it takes so much time for the university to transfer your money back and why the do not answer your e-mails. They cannot seriously think that they can just keep the money if they simply ignore you.)
Please feel free to contact me. You can find my availability here on my LegaMart profile.
I would not charge exorbitant fees for such e-mail correspondence with the university.