Since Support is absolutely useless. Maybe someone here will know what's going on.

[DamnBruhYouSuck]

I used to have my Spotify connected to my Google home. Sold it a long time ago and now someone is somehow accessing it and playing without having my phone? It keeps showing a connection to the speaker and the song keeps changing. I changed passwords and have now finally figured out how to revoke access to the device ( I think) is there anything more I can do? Has anyone had anything like this happen?

[Joe]

Did you factory reset it before selling? If not, that's the problem.