I have helped hundreds save their accounts from hackers, so let me give you some help.
As long as they haven't enabled 2FA you should be fine. Even with 2FA recovery is possible, yet pretty harder.
Here's how you recover your account:
Go to the basic login page, click on "Forgot your login details? Get help logging in.".
Once you click on that, enter the username of your account as it is now. If the hacker changed the username, make sure to use the new one.
When you write that down, click on "Need more help?" at the very bottom of the page. Everything after that will be self-explanatory.
TIP: Try using a device that the account has been used on before.
Best of luck
PS This method is almost instant, sends you an e-mail to the previous e-mail that was used (this means yours) as long as everything goes well. It doesn't reach out to a rep, it's simply a quick recovery method.