Hi @Nino338 I hope you are well.
I don’t think there is much you can do apart from appeal to the person who created the account to give you the login details- which I assume you’ve done without success.
I know it doesn’t help for this time- but if you hire someone in the future to set up a new account for you or you need to give a co-host access to your account to do something on your behalf that they can’t do from their co-host account, it’s a good idea to change your password after to ensure you keep overall control of the account.
Best wishes
Paul