Missing DLC, EA says i need to purchase it again.

I wanted to play Simcity today. The Cities of Tomorrow add-on was missing from my library. After 70 minutes on support, the guy told me he couldn't do anything and I had to buy the add-on again. I have my old key, activation date, the last time I played this add-on was in 2022 and everything worked. I really don't know where to turn because I don't intend to tolerate this theft that EA is doing. I paid for the add-on, I didn't delete it from the app, they deny any fault and since it's an old game they can't help me and I have to buy it again.