Can't link Steam account as it says already linked with someones else's

Thanks @EA_Barry for the quick answer.

I have checked the article you've linked, installed the EA App and it doesn't propmts me to link anything (as it probably detects that smtg is linked).

On the other hand the Unlink cannot be done either since the Connections tab on the EA Account settings portal show a Link button instead of Unlink, and when I try to link mine, it shows that smtg random linked to it. So this functionality seems bugged, probably some corrupted data partially bound to it already, as it is linked to something but the EA portal where the actual unlinkind should be made doesn't detects it at all. Are there any technical support option who can fix it?

Thanky you for your kind help beforehand.