My employees are receiving a feedback survey email that I never send. Why is that?

This happens because of a workflow by the name 'Default Satisfaction Survey' that is configured by default in Vtiger CRM.
The workflow sends a survey email to an employee when their internal ticket is marked as Resolved. The intent of the email is to take the employee’s feedback on the resolution.
You may choose to not receive the surveys easily by deactivating the workflow.
Follow these steps to deactivate:

1. Log in to your CRM account.
2. Go to Settings.
3. Go to Automation.
4. Select Workflows to view the workflows on Internal Tickets.
5. Look for the Default Satisfaction Survey workflow.
6. Disable the toggle button located on the left of the workflow list to deactivate the workflow.