Motown box set stuck in Sonos library.

I had the best of Motown box set in my Apple music library. Something changed with the distribution rights maybe and Apple changed it from a box set into all individual albums with just the songs in the box set. I removed them all from my Apple library but they are still in my Sonos. Sonos support engineers are unable to resolve the issue. I am fine with clearing all my music from both libraries.