Bad experience with vodacom

It seems like I'm going to regret why I took contract phone with vodacom firstly they busy playing in my bank account trying to debit on the day we didn't not agree and the amount we did not talk about and its busy bouncing and is charging I'm so disappointed in the way Vodacom does things no one told me about the R175 that I'm suppose to pay after getting the phone now there's an extra R100 that I don't understand about I'm suppose to pay R350 every month but now it says R624 for what I don't understand