CHARGED FOR DATA USAGE

I HAVE BEEN CHARGED FOR BUNDLE USAGE R1640.00 I HAVE LODGE A COMPLAINT WITH REF S3-8UJ1D-DY522 THE SIM THAT THE DATA USAGE WHERE FOR IS ONLY GET USED ONCE IN A WHILE TO DO MY BANKING ON( SIM IN ****LE) WHEN I WAS CALLED BACK, EVENTAULLY AFTER SEVERAL ATTEMPTS TO SORT OUT THIS PROBLEM,THE PERSON TOLD ME THAT HE CANNOT PROVIDE ME WITH THE PROOF THAT I HAVE USED THOSE DATA DUE TO THE FACT THAT IT HAS ALREADY BEEN ARCHIVED. IN THE MEANTIME I HAVE OTHER SIM CARDS ON THIS CONTRACT AND ALL THE OTHER LINES HAVE BEEN BLOCKED DUE TO NO SOLUTION FROM VODACOM TO HELP SORT OUT THIS PROBLEM. I GET THREATENING CALLS AND LETTERS FROM THEM BUT NO SOLUTION TO THE PROBLEM. I HAVE BEEN A CUSTOMER OF VODACOM FOR A VERY LONG TIME AND DO NOT DESERVE THIS AT ALL.