You can delete your Celestum account and everything in it at any time.
If you can't open the app, write to support@celestum.com.co from the email address of your account, with the subject "Delete my Celestum account". We'll delete it within 30 days and write back when it's done.
All of it is removed for good; we don't keep a copy. Deleting the app from your phone alone doesn't delete your account.