Unauthorised debit order

This month I noticed that some company had debited my account with R99.99. I called the bank and gave me another number to call : ***. I called on Monday the 27 to ask where they got my bank details from and that I wanted my money back in my account. Candice promised that by end of day the money would be in my account. Then 2 days later still with no money in my account, I called again and this time spoke to Tricia, who promised me the same thing. 2 days later still no money in my account. This morning I spoke to a Chanelle Naidoo, who said she was a supervisor and she would have the money in account within an hour of the phone call. 2 hours later and still no money and no one is answering the phone now. I want to know where you got my bank details from? I am going to report this company to the FSB this is *****.