How do you make offline mode stay offline?

[abc12345677]

Plan

Premium

Operating System

Android 

My Question or Issue

I switch spotify on my phone to offline mode when I am at work since I listen to spotify online at my computer. Spotify switches back to online mode on my phone without me doing anything. Why is it switching back without  my consent? Is there a way to disable spotify connect? This "feature" only causes me headaches and I do not understand how it could possibly even be useful other than for spotify to collect my personal data. I do not want my phone to go back online unless I specifically tell it to. I want my phone to stay offline so that it always plays my offline music and never use my data. With connect no music plays when I get in my car since it is trying to play the  music from my online work session from my computer.