Any company is legally entitled to charge an "administration fee" for providing a service, and in Ryanair's case the administration fee always exceeds the taxes and charges that should be refunded in the case of a cancellation. The fee may be disproportionate, but that's the way it is.
You will never, ever get a refund from Ryanair if you have chosen to cancel a booking (and it is difficult even if they have cancelled a flight).