Unauthorized debit order nightmare

Good day. I had an unauthorized debit order from this Company on my absa bank account. They've never contacted me I don't have any outstanding loans with them. They just deducted all my salary they left me with 2000 I just need my money to be transferred back to my account. I'm so furious with this bank. Where are the ethics here.that they can just do as they please to our account to show us they have powers to do so. I want my money back to my account