debit order went through without my go ahead

on the 12 of June i received a call from Ebrahim Kippie from MotorVaps, he was calling me back after i requested a quote for vehicle plan, in our conversation he requested my details in order for him to send me the quote and i gave him the details together with my banking details and he mentioned that he will only send through the debit order request once i agree to the documents that he will send me. i received the documents and went through them then i sent him a mail back to say i am no longer interested in the plan. However this morning i got an SMS notification from my bank of the debit order. i am extremely furious about this.