I would say your actions caused the irrevocable reputational damage that Rock Trading has faced over those long years. You could solved the issue easily but decided to get revenge on the OP who is the rightful owner of those funds because they created this thread.
I am asking you to apply common sense as well as a sense of decency here please. There is nothing stopping you converting the 35,000 EURO back to Bitcoin and sending back to the same wallet address you received it from. As a compromise just for the sake of ending the drama, is that something you would consider doing?
After all this length of time what have the Rock Trading achieved? Was it worth it?
Yes it was. We protected funds belonging to our customer.
The OP had multiple choices to solve the situation in the past 4 years but, he never chosed to pursue a single action because he cannot prove to be the account owner.
As simple as that.