OVERCHARGED AGAIN!!

I HAVE BEEN DELAYING TO WRITE THIS COMPLAINT FOR SOME TIME BECAUSE I CANNOT BELIEVE THAT I AM WRITING ANOTHER DATA CONTRACT COMPLAINT. I HAVE A R99 DATA CONTRACT WITH VODACOM WHICH I TOOK ONLINE. WHEN THIS CONTRACT WAS APPROVED I RECEIVED A TEXT MESSAGE FROM VODACOM THAT I HAVE BEEN APPROVED FOR ABOUT R16 000 WHICH I DIDN'T UNDERSTAND. I THEN CALLED VODACOM AND ASKED THEM TO PUT A R50 LIMIT ON MY ACCOUNT BECAUSE THAT IS THE AMOUNT I CAN AFFORD. I HAVE BEEN CHARGED OVER R1000 IN THE PAST MONTHS AND THIS MONTH I AM SITTING WITH A BILL OF R842.67 (FOR THE PREVIOUS MONTH). THE PROBLEM IS THAT I DON'T EVEN RECEIVE NOTIFICATIONS ON MY DATA USAGE (WHICH I USED TO RECEIVE). ON THE 1 MARCH, WHEN I REALISED THAT MY DATA USAGE WAS SKY ROCKETING WITHOUT ANY DOWNLOADS OR UPDATES, I CALLED VODACOM AND SPOKE TO ABEL I THINK AND HE COULDN'T EXPLAIN WHY AS THEIR SYSTEMS ARE NOT ON REAL TIME AND PROMISED TO CALL ME BACK AS SOON AS HIS SYSTEM HAS BEEN UPDATED - WHICH NEVER HAPPENED. I RECENTLY LOGGED ANOTHER CALL WITH JANNEY/JANINE WITH THE REF # S3-82W2U-UFQEI AND STILL NO RESPONSE. I AM VERY UNHAPPY BECAUSE I CANNOT TAKE RESPONSIBILITY FOR FAILURE OF YOUR SYSTEMS.