KeyDirect Scam SMS deducting money

I received a SMS saying that debit order will go through my account on specific day for 115.00ZAR. I have never ever heard of this company & Never authorized any debit orders with my bank. I asked my bank to help & they said I need to speak with KeyDirect. This is horrible how can someone just start deducting money from your account. Where on earth do they get our details.........