My friend's account got deleted without reason?

What I would first try is creating the account again using the same email, and then manually linking the player progress to the account.

Link your Xbox Live gamertag or PlayStation Network ID to Origin like this:
1. Log in to your Origin account
2. Click Friends -> Add a friend in the menu bar
3. The pop-up will give you the option to connect to Facebook, XBOX Live or Playstation Network. Choose your preferred option
4. Fill in your log-in details and follow the steps on screen

Please contact an Electronic Arts Technical Support adviser here if you experience any problems, or cannot link the account properly: http://help.ea.com/en/contact-us/new/
1) Click on the game you're having trouble with (If you can't see it, use the search bar)
2) Select a topic for the best results.
3) Scroll to the bottom and select 'Contact Us'.
4) Select your platform and list a short description of your problem.
5) Select 'live chat' or 'call me' to request a callback from an EA games adviser.

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Keep in mind that I do not work for EA, I'm a gamer just like you!

Thank you so much for the answer, but the thing with manually linking the player progress to the account, is it the same steps on PC? Because we're on PC. And if you ahve time, a in depht quide would be awesome, but I understand if not, I will try to find one myself. I might seem stupid, but when it comes to this, I'm kinda retarded. Thank you so much for your time.