Unauthorised TELLER TRANSFER DEBIT- forex operatio

I just received an email notification of a FOREX OPERATIONS GENERAL - TELLER TRANSFER DEBIT from my ABSA savings account. How is this possible whilst I'm not even inside the country? I am done with ABSA if this is one of their employees. I cannot even concentrate and is in much distress as an amount of R8,704.02 is now missing from my account which was there to cover for family related expenses and further debit orders. I am going to avoid using this account until this matter is resolved and will be taking legal action against ABSA should I discover that they allowed someone access to my account as I am a very secure person when it comes to banking.