Fed up

So i made a complaint last week about R1 that is disappearing from my account daily i know that this might sound stupid because its a small amount, however an adviser called and her explanation didnt realy make sense To top it all no form of verification was done before discussing the account with me so that means anyone can just call in and pretend to be me. Today i checked and R11, 20 was missing from my account!I wonder what lie they will spin me again. Im really fed up even though it may seen like a little money to you but amount to alot if its all added up and imagine how many customers are affected and dont even notice. Stop *****ing small amounts from customers in order to make money!