I'm pleased the recommendation worked out. I'm afraid I've only once taken a taxi from close to the airport to the city centre, and that was when a group of us ran the marathon in 2019 and it was too early for public transport, and it certainly wasn't anything like €55. I also once arrived too late in the evening for the hotel shuttle bus, and an approximate 3 mile journey after midnight was €10.
Every other of many rides has been using public transport, but I'd tend to agree - something happened that shouldn't have done, and based on my limited experience the fare should be somewhere between €20-30 Euros depending on traffic. I can only think the driver went down the M50 and through every toll point going. That is completely unnecessary and saves only a couple of minutes normally.