Nedbank ******* debit on my savings account

This is the 2nd time this is happening to me, they *******ly debited my savings account and I do not know the reason. I have spoken to 7 people who put me through to ghost departments (the lines went through but no one spoke on the other side). All calls took 20-25 minute. I am so frustrated. I need to speak to a person who can tell me why Nedbank is doing as they please with my account. I am seriously considering closing it. Ref NBIB25772