I will use tuneskit DRM audio converter, which can convert any DRM protected music to common used MP3 format without quality lose. I think it’s more cost-efficient.  https://www.tuneskit.com/drm-audio-converter-for-win.html

There are four different ways provided here to recover deleted iphone voice mail. https://www.tuneskit.com/iphone-recovery/how-to-recover-deleted-voicemail-on-iphone.html.  I used one method mentioned here and it works successfully. 

This topic is so hot these two days. I also met with the similar article here: https://gizmodo.com/yes-you-can-own-the-movies-you-buy-from-apple-kinda-1829031620, which mentioned TunesKit (https://www.tuneskit.com) can perfectly resolve the DRM issue related to iTunes digital content. It may be worth for try.