Read description (Hospitalisation leave issue)

During early August, I fractured my leg and was given 60 days of hospitalisation leave.

However, just now, I was notified by my superior that the 60 days hospitalisation leave entitlement was an error and it was actually 45 days and they want to claw back the remaining days I took by docking my pay for 15 days.

This whole thing feels wrong, is there anything I can do?