fishes hi,
I had the same experience with Ryanair some time back. Don't give up! Keep on contacting them. My strategy was that I phoned everyday - it was an answer service but I left a message. I wrote - everday giving details of the bag, the flight etc. I discovered a few interesting things along the way. If the bag is gone for more than 28 days it can be deemed permanently 'lost' and the airline will only compensate you a set price per kilo weight of the bag - you may need to check this in the small print - for me it would have been 200 euro which would not have replaced the contents. I also discovered that my travel insurance would not compensate as I was expected to have original receipts for the items and even then there was a 'ceiling' etc. - this may have changed since then.
Apparently all lost baggage for Ryanair if/when it does turn up is returned to Dubln Airport as the central hub. Ask if you can go and check the lost baggage area for yourself (maybe with current restrictions this might be a problem). Anyway I got clearance from Ryanair to go and look in their returned/lost luggage area in arrivals at the airport - after five weeks I wasn't expecting much - but there was my case! Intact with my business card attached with name, address + phone number. They said it had just arrived on a flight that morning....
..worth a try though. Hope it turns up for you as I know that I would have been furious to lose the contents of my luggage. Oh, and by the way apparently the luggage that does turn up after the 28 days and is not 'claimed' or cannot be returned is auctioned off!
good luck with the search.