"could" being the point here - as Joe Bloke, you're not going to get yourself into a legal dispute with Google, but it's not very hard to return an electronic device as an ordinary end consumer when it's still under warranty.
Better to just contact NOYB directly, they are responsible for about 50% of all GDPR fines to date. Outside of Norway the DPAs seem mostly useless, especially when it comes to big tech…
Confiks managed to get Spotify to reinstate the API that allowed connections to SongShift with a GDPR complaint about the right to data portability (or threat thereof): https://news.ycombinator.com/item?id=24764371