https://www.icann.org/resources/pages/domain-name-renewal-ex...
I don't know if you have any legal options but according to ICANN, you should be able to renew the expired domain without extortion.
Keep an eye out for renewal reminders
ICANN policy requires registrars to send you two renewal reminders approximately one month and one week before expiration of a domain name. Take immediate action when you receive these reminders to avoid the potential of losing your domain name. Be sure to keep your contact information up to date so that you receive these important reminders.
Additionally:
My domain name has just expired. Can my registrar require me to pay for a renewal before I can transfer the domain name to a new registrar?
No. You have the right to transfer an expired domain. Registrars are not allowed to deny a transfer due to expiration or non-renewal. (unless you haven't paid for a previous registration period).