OVER CHARGING CUSTOMERS WITHOUT NOTIFICATION

I took a 2nd contract with VODACOM and bought a home Router, My contract stipulated a monthly debit order amount, my account was increased without informing ME and the debt order came out of my account, every month VODACOM is deducting new amounts, from my ACCOUNT I DID SEND EMAILS TO CUSTOMER SERVICE AND SPOKE TO A MANAGER AT THE CORNUBIA BRANCH NOTHING WAS DONE TO RECTIFY MY ACCOUNT. I ALSO DID NOT ADD INSURANCE, BUT THE SALES LADY AUTOMATICALLY ADDED INSURANCE WITHOUT NOTIFYING ME. UP UNTIL NOW MY ACCOUNT IS NOT RECTIFIED. THANK YOU.