no one helped

ON MY INTERNET BANKING I HAVE A DEDUCTION TWICE OF THE SAME AMOUNT. I WENT INTO THE BANK AND THEY TOLD ME TO CALL THE CALL CENTRE. I STILL HAVEN'T GOT A ANSWER WHY I HAVE THE SAME AMOUNT DEDUCTED TWICE. WHATS THE POINT OF GOING INTO A BANK IF YOU ARE TOLD TO CALL A CALL CENTRE.