Vodacom is a *******

Wow vodacom is a *******!!!!! i have various contracts with vodacom , on my one line i receive 10gigs of data , i then noticed on my bill for May i was charged for 5GB data which apparently i supsribed, dont know how i told them cancel it why must i pay for extra data. Junes invoice came i was billed, July invoice came im billed again. This is absolutely ridiculous. I want this charged removed off my account IMMEDIATELY. Clearly someone at vodacom didnt do there job properly and remove it in May like i asked!!!