BEWARE: CELLPHONE ACCOUNT WITH TELKOM

I TOOK OUT AN CELLPHONE ACCOUNT WITH TELKOM MOBILE EARLIER THIS YEAR. MY MONTHLY DEBIT ORDER IS R399. LAST MONTH THEY MADE A MISTAKE AND DEDUCTED R4995 FORM MY ACCOUNT.AFTER NUMEROUS VISITS AND PHONE CALLS THE MISTAKE WAS APPARENTLY RECTIFIED, BUT I AM NOT GETTING MY MONEY BACK!!! INSTEAD, THEY ARE NOT GOING TO TAKE OFF THE MONTHLY INSTALLMENT OF R399 FROM MY ACCOUNT, UNTIL THE CREDIT THEY OWE ME IS USED UP. THIS IS CRAZY!! WHAT ABOUT THE INTEREST ON THAT MONEY? ITS THEIR MISTAKE, BUT I HAVE TO WAIT A YEAR FOR THEM TO PAY BACK THE MONEY? DO NOT EVER TAKE OUT ANY ACCOUNT WITH TELKOM MOBILE, UNLESS YOU WANT THEM TO DEDUCT LARGE AMOUNTS OF MONEY FROM YOUR ACCOUNT WITHOUT WARNING AND THEN STRUGGLE FOR A YEAR TO HOPEFULLY GET IT BACK!!