MTN SUCKING THEIR CLIENTS DRY

TOOK OUT A CONTRACT FOR MY SON, A MY MTNCHOICE TOPUP R55. WITH THIS PACKAGE YOU ONLY GET R55 WORTH OF AIRTIME NO DATA OR SMS'S. I HAVE 4 CONTRACTS WITH MTN. I THEN NOTICED THAT ALL MY CONTRACTS HAVE BEEN BLOCKED FROM MAKING CALLS OR USING DATA. I CALLED MTN AND WAS TOLD THAT I HAVE REACHED MY CREDIT LIMIT WHICH WAS ABOUT R8250. I ASKED HIM HOW THAT IS POSSIBLE BECAUSE I HAVE A DATA ONLY CONTRACT AND 2 TOP UP CONTRACTS AND MY OWN WHICH IS AN ANYTIME 200 CONTRACT. I ASKED HIM WHICH OF MY CONTRACTS RAN UP SO MUCH DATA OR CALLS AND HE SAID BECAUSE THE BILLING TERM HASNT BEEN REACHED HE CANT TELL ME WHICH ONE RAN UP THAT AMOUNT. SO I RECEIVED MY BILL AND DISCOVER THAT IT WAS THE CONTRACT I TOOK OUT FOR MY SON WHICH IS A TOPUP THAT RAN UP THE BILL. SO MY QUESTION IS HOW IS IT POSSIBLE FOR A TOPUP TO RUN UP DATA IF IT IS A TOPUP? ARE YOU MTN MILKING US DRY WITH ALLOWING A TOPUP CONTRACT TO HAVE CREDIT LIMITED DATA RUN UP??? I PERSONALLY THINK YOU ARE RIPPING US YOUR LOYAL CLIENTS OFF. SO HOW MUST I PAY MY OTHER BILLS NOW SEEING THAT YOU JUST DEBITED MY ACCOUNT WITH A WHOPPING R9279,37? IM VERY ****ED OFF!!!