Can't unlink a Spotify account from my Sonos

Well, about a year ago, I used a Sonos Speaker (don’t remember which one, I remember it was white and kinda round but also tall). I used it because it was set up in a lodge I rented for a few days to go skiing. So, I set up an account and linked my Spotify to it. Well, yesterday, someone, who probably rented the same lodge as I did, connected to the Sonos speaker, and my Spotify account started playing random songs on my phone. There is absolutely no way I can get to that speaker to reset it since it’s in the lodge. I tried to go unlink devices in the Sonos App, but all of the Settings are greyed out, is there anything I can do, because I don’t want to create a new Spotify account because of this. Thanks