High data usage? – Melodies for relax and focus Review

This is a wonderful app for relaxing before falling asleep. I just deleted it however since it appears to use a lot of data even when I set the timer. There was no button for "Melodies" to turn off cellular data or for background refresh. Verizon techs said something was still running during the night even after all other apps etc. were turned off. If it is not this app, I will update my review. Once downloaded, I did not expect any data usage by this app. I would like clarification by the developer!
Review by Sue Midland on Melodies for relax and focus.