Google Account Hacked: Recovery Phone Number And Password Changed Without Permission

I am writing because I no longer have access to my Google account and all my attempts to recover it have failed. My account is associated with the email address “blancoumi***@gmail.com”. About twelve months ago, I noticed that the recovery phone number linked to my Google account had been changed without my request. At that time I could still access my account, so I did not manage to correct it. Around 30 days ago, the password of this same account was also changed without my authorization. Since then, I have been completely locked out. When I try to sign in or recover the account now, the system directs me to the modified recovery options, which I do not recognize and cannot use. Because the recovery phone number and password were changed, I have no way to confirm my identity through the usual automated process. I kindly request that you manually review my case, investigate this unauthorized modification of my recovery number and password, and restore my access to the account. I am ready to provide any additional information or verification you may require in order to confirm that I am the legitimate owner of this account.