UNAUTHORIZED DEBIT ORDERS

DMC DEBT MANAGEMENT IS DEDUCTING MONEY FROM MY CAPITEC BANK ACCOUNT WITHOUT MY AUTHORITY. THEY STARTED BY DEDUCTING R250.00 WHICH I DISPUTED AND STOPPED. AND NOW THEY'VE BEEN DEDUCTING MONEY R500.00 FROM MY CAPITEC BANK ACCOUNT FOR TWO MONTHS WITHOUT MY AUTHORITY. THEY DID NOT SPEAK TO ME ABOUT THIS AND WE DID NOT ENTER ANY AGREEMENT. IM AN UNEMPLOYED SINGLE MOTHER AS I LOST MY JOB BECAUSE I WAS DIAGNOSED WITH CANCER, I BECAME VERY ILL AND I COULDN'T WORK ANYMORE AND I'M CURRENTLY ON TREATMENT. MY SISTER IS THE ONE WHO IS ASSISTING ME FINANCIALLY. I BELIEVE THAT I HAVE A RIGHT TO GIVE AUTHORITY AND AGREE TO PAY AN AMOUNT THAT I CAN AFFORD AND NOT LIKE THIS. NOW THEY DEDUCT WHAT EVER THEY WANT, HOW AM I SUPPOSE TO LIVE. I WANT DMC DEBT MANAGEMENT TO REFUND ALL THE MONEY THEY HAVE DEDUCTED WITHOUT MY AUTHORITY FOR THESE TWO MONTHS.