Formal complaint

Good evening, 

Someone has accessed my account for the third time in FC24, I have lost nearly all my tradable players and have had 450k taken/spent. I’m getting to the end of my tether, I have lost over 1 million coins intall. I might get the coins reimburse but the players that are gone as in 100 players on my transfer list rated between 83-89 I won’t get reimbursed for. Does anyone know how I would make an official complaint. I’ve played every fifa and nothing like that has happened to me never mind on 3 occasions