I’ve been subscribing to Groove Music Pass since it was called Zune, and truth be told I would not mind continuing to pay if the service kept going, despite also subscribing to Spotify.
However, with the above message greeting you when you run the app, there is not really any point, with no access to playing music you have not already purchased.
It seems, however, Microsoft is quite happy to continue taking your money without providing any service, as they have continued to bill people for January 2018, despite not having a streaming service.
Reportedly Microsoft Store support is happy to process a refund, but I suspect they will be pretty busy over the next few days given that it appears all ex-subscribers have been billed.
Do you have an excess charge on your account? Let us know below.