Thanks posting here in the Community! We'll gladly shed some light on the situation.
We understand that accidents happen, that's why we've introduced a pop-up banner that allows you to undo the dislike right after the button has been clicked. This banner comes up on the Discover Weekly, Release Radar and Daily Mix Playlists. At the moment there isn't another option to do this at a later point in time.
If you think that other users would like that all your dislikes appear as a list that you can also edit, we suggest that yousubmit an idea on our board, that requests this feature. This page has detailed instructions on how to do this.
The Idea Exchange is a great way for us to see what improvements our users would like to see and how many people support a specific idea. You can learn more about it here.
Hope this is helpful but don't hesitate to let us know if you have any further questions!
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“Music is a language that doesn’t speak in particular words. It speaks in emotions, and if it’s in the bones, it’s in the bones.” - Keith Richards