Upvote:1
According to the EU
If the airline does not provide you with a satisfactory explanation, you can contact your national authority documentfor further assistance.
With a linked PDF containing the list of the respective autorities
I highly suggest you to follow EU guidance and contact your home country's authority, especially since you have the cancellation/delay reason in wrting (if you don't live in the EU, I think you would be able to contact the Irish authority as Ryanair is based there)