Standard bank *****ing money from my account

Standard bank have debited an amount of R550 from my account without valid reason firstly in September and I phoned them to enquire about this amount being debited without my knowledge and they stated it was their international share trading services which in my knowledge this account was closed in February and the agent reversed it and promised me that it won't happen she will put in an enquiry on my behalf and yet again for the month of October they debited the same amount and to my shock when I've been trying to reverse it yet again this time they telling me they can't reverse money being debited by the bank itself and I've enquired with 4 consultants and the international share trading consultants who have all just hulled me with insults that if the bank takes your money out of your account you can't reverse it or get it back, I've taken the matter to their complaints department but they also seems not to care as the matter is not being resolved or being offered feedback. Standard bank please pay back my money