Since September 2024 my deezer app is using a lot of data, commonly when not in my wifi areas I play only downloaded songs, sometimes a little flow, that used to be 1 or 2 GB a month of mobile data, but in September something changed and deezer used 20 GB of data in 3 days.

I must clarify that I have the don't download songs in mobile on, low spec songs play only and I play downloaded songs like 90% of the time.

Well after that I turn on the offline mode, and in the beginning of October in the first day it used more than 2 GB, with offline mode!!

So I used android restrictions, not allowing the app to use mobile data ever.

Please check that. 

I'm using a Samsung S24, Android 14