When you change your music service from Spotify to another, then you can follow the step below to cancel it by yourself. It is easy to make it.
Step 1. Go to Spotify Website and then click to Log in with your Spotify Premium account.
Step 2. Hit the Profile button and then select Account from the drop-down list.
Step 3. On your Account overview page, click to Subscription and you can see the Subscription and payment detail information.
Step 4. Click to the Change or Cancel button and scroll down to Spotify Free option and then Cancel Premium. On the thinking or leaving page, click to Yes, Cancel and then finish the whole cancel Spotify premium action.
Warming note: Please make sure to keep downloaded Spotify songs first after canceling Spotify premium.