To delete your Samsung Account:
Go to http://account.samsung.com and tap Sign In.
Enter your Email and Password and then tap Sign In.
Tap Delete Account and enter your password.
Tap Continue -> I accept -> Confirm -> Confirm.
When you delete your Samsung Account, your details will also be withdrawn from all connected Samsung services. In addition, all information that belongs to your account, such as downloaded items, purchase history, etc. will also be deleted.