According to the laws of our country, if you can't prove the illegal possession of the detailed law, then both of you have a civil legal relationship with the training contract, and you need to prove that the other party legally broke the contract or failed to perform the contract through consultation before you can ask for the return of the paid money. In this case, the other party has completed the training and fulfilled the main obligations of the contract. Your claim for returning the training fee lacks legal basis and it is difficult to get it back.