If you are no longer interested in using Snapchat and would like to delete your Snapchat account permanently, then follow the steps below:
Sign in to your Snapchat account, go to the setting, and then click on the “I Need Help” option
And then, on the next page, search for “delete my account” and tap on the “Delete my account” result from the search.
Then, you need to click on the “account portal” option, and then finally confirm your deletion process after filling in your username and password.