Vodacom *****ing my Kids diaper money

Last month Vodacom attempted to debit my account with R710.78 whereas my installment is R175. With Bank charges of R110. leaving me with not enough money for my other debits. This month the fools attempted to debit my account with R678.35. Again with bank charges of R110. You should be paying me the bank charges. Why the odd amounts? I honestly feel like canceling this contract as it was the biggest mistake I ever made going into business with Vodacom. The phone is a big a dud, you can barely hear anything. And the only place where it can be fixed is in another suburb miles away. AND tell me why you robing the people by them paying to have the caller ID activated. A FREE service that one must pay for. Why are you robbing your clients like this. When can i expect my R220 for bank charges. That was my babies diaper money.