Billing for services not wanted

I upgraded my account and moved from BIS contract to a top up where I have 150 and can opt to buy data. After my first month billing I was billed for BIS and had and additional 150 Month to Month billed to my account. I was informed that it will be corrected and removed from my account. <br> I dont view the statement monthly and trust that vodacom is billing correctly. In August I got another huge account and on viewing the statement found that the BIS is still active and there is also the 1GB month to month again activated. Logged another call to correct this and waiting feedback.<br> I opted for top so that I can manage my account, phone is used by someone else. I requested that they change the monthly 150 to recurring 1GB data to avoid having issues as they current system requires we do it monthly i.e. use there self help service to switch the 150 to data and the system than activate a recurring month to month that we dont want. <br> I dont want any additional recurring charges on my account and if they cant help me in setting up the system to convert the R150 rands to monthly data they should correct there self help system to ensure there is a clear distinction between once off and month