an unauthorised debit on my account

<p><strong> So this morning (01 May 2016) I received an sms from my bank showing that R99 was debited from my account on the 31st May 2016. I don’t know who this people are, I have never done any business with them, and I don’t know who gave them the authority to do as they please with my bank account? Is my money safe? Is this AMKAY TRADING AND MARKETING some sort of **** *****ing people’s money?</strong></p>