debit

I do not understand the following. I do payment to snupit with my card and receive mails Thank you we receive your payment. Next month i do receive a debit order from my account to snupit. R290.00. How is this possible that snupit got hold of my account? allowing the payment benifisary to debit from my account? This is telling me that many payment that is done with my card, allow anyone to debit monthly from my account? Doing this with 1000 clients, i a lot of intrest money? If you quirie, its only, sorry, we do not understand and you have to wait for refund but they do not wait?