Sorry to hear you want to delete your account. You’re welcome back any time!
To delete your account at what3words.com:
Click the menu icon in the top right corner.
Select your name. This should be above Saved locations.
Scroll down to the Delete profile section and click Delete.
To delete your account in the what3words app:
Click the menu icon in the top left corner.
Tap your name.
Select Delete account.