Apple didn`t believed me that I am the trully owner of the MacBook

Hi, I am Ivan from Ukraine. I am a firstly user of the Macbook Air. I was scammed by fake customer, who told me to sigh out of my Apple ID account and sigh in to his Apple ID account on my device. I did it because I though that I do have to do this to ensure the customer to buy my product. I am the trully owner of the Macbook Air and I just asked the Apple to help me with this, but Apple didn`t. They told me that they cannot sigh out the last scammer account, because they cannot ot do this thing. They cannot help me with this thing and so it means that all my money that I spend on my mac is just a piece of nothing.

I have every proofs that it is my Mac it is down the message. I am in really bad sitution

And now I am the owner of the piece of aluminium, not a Mac.

[Edited by Moderator]