Delete your account using the app

• Go to Profile , then Settings
• at the bottom find delete account
• Follow the remaining steps in the app to complete the process

Or you can delete from here

Delete My Sita Account
• Upon completing either process above, your account will be immediately deactivated and scheduled for permanent deletion after 30 days. Any unused credits, promotions, or rewards will be forfeited. If you sign back into your account within this period, the deletion process will be canceled, and your account will be fully restored.