Unauthorised Debit Order

I have picked up a debit order on my bank account for the amount of R99 and after contacting my bank and numerous phone calls tracing the company that gave the debit order instruction it came up as Crystal Enterprise in Richards bay? I live in Durban. I phoned them and asked what the nature of the business was and he said it's a student tutoring service. When asking about the money being debited from my account and asking for proof authorising this debit order he couldn't and said he will have to speak to his accounts department and will only get back on Monday. I said it's not good enough I need info immediately or I'm on my way to lay a charge at the police station. Within the minute he phoned back and said they will refund the money it was a mistake on their side???? Please be careful and check your bank account for any strange debit orders being deducted, it's usually a small amount so you don't pick it up immediately. This is the third time it's happened to me.