Vodacom unlimited calls

I took a contract with Vodacom in July 2022 for my brother who is in university and my monthly installment on the contract showed R208. 99 and the first pay they deducted R262 but I did not mind think maybe it was extra fees or something. Last they deducted R556. 44 immediately called and the consultant told me about unlimited calls, asked her to cancel it because I was not aware of that and in my contract it was not stated and I told my brother to check his minutes and if finish he must not make any calls as I am being charged for unlimited calls. The big suprised was when I got my bill for this month and it says that I need to pay R3262.10 even after I asked to cancel it