Deducting money every second day for no reason!

I booked a place to stay via Booking.com The amount was deducted succefully. Since then, Booking.com has been deducting R15.99 from my credit card every second day for no reason. i cannot get hrough to them. Contact me URGENTLY to explain what the hell is going on or I will take this matter further and make a case against the company for *****. Call me ***