My Valorant Account Hacked and Email Changed Without Notification

My Valorant account got hacked when my email address was changed without any confirmation code or notification. I'm having trouble updating my username and password. I need assistance urgently as my account has been taken over by someone else. I can confirm that this account belongs solely to me. I have been using it for a year and a half without any unauthorized access. I had just reached Platinum rank, and it was quite a challenge to reach that level. I would greatly appreciate your assistance. If they wanted to, they could easily modify the username and password.