***** debit orders

I realized that a debit order of R129.99 went off my cheque account end of march and end April. After I phoned the First Nat Bank, they gave me stratcor's number ***, who turned out to be the middle man. They only run the debit order for money tips. I phoned Money Tips on ***. They politely apologized, said it would be stopped and refunded. Which they did the following day. My problem still remains: how is this possible ? Nobody can answer me. Money tips , whom I phoned said they will 'investigate', and will let me know. Money tips on the internet is an American company who do not consult in SA I want these people to explain to me how is it possible to run a debit order without my consent.