SEEMS LIKE NO ONE UP THERE HAVE ANSWERS TO PROBLEM

I UPGRADE ON 1 jULY 2015 ON MY DATA NR ***, I ASK FOR THE SAME PACKAGE (TOP-UP) BEC AUSE I DONT HAVE WORK NOW AND I NEED TO KNOW WHAT MY EXPENSES WILL BE AT THE END OF THE MONTH. THEN I RECEIVE A SMS THAT SAID YOU HAVE REACHED YOUR CREDITLIMIT OF R3329. NEVER IN MY LIFE WOULD I GIVE THAT LIMIT. I START PHONING AND GO TO THE SHOP AND PUT IN REQUEST AND ASK AND PHONE LIKE MAD. BUT ON 14 SEPT THEY SUSPEND MY PHONES WHILE I WAS ON THE ROAD AND I HAVE A BUSINESS TO RUN WITH PHONE AND INTERNET. I WENT TO CUSTOMERCARE IN BLOEMF AND THEY COULDNT GIVE AN ANSWER AS WELL ON WHO ARE RESPONSIBLE FOR THE BILL, BECAUSE I WOULD NEVER EVER UPDATE IF THIS WAS GOING TO BE THE AMOUNT TO PAY. I AM AT MTN FOR YEARS AND HAVE 4 CONTRACTS(MY KIDS) WITH THEM. THIS IS MY FIRST PROBLEM AND I AM VERY DISSAPOINTED WITH THE WAY THEY HELP ME BECAUSE WE DIDNT GET TO A SOLUTION. MTN VRYBURG ALWAYS SET A ZERO LIMIT. IT SEEMS LIKE A SYSTEMFAULT. MTN MUST JUST REVERSE THE FAULTY AMOUNT BUT IT DIDNT HAPPEN..... COULD YOU HELP ME TO GET THROUGH THE CEILING....?????