my account changed

In may I started getting high banking charges and I called fnb callcentre only to be told that its service fee and then in june it hapend again and I visited branch in secunda and was told that its because I changed my account from savings to cheaque but I did no such and the lady who was helping me said the system say I have changed it even though I kept telling her I did no such and end up saying they will call me about the issue but even now I recived no call or explanation of how can they change my account from savings to cheque without my consent while at the same time they still take the R49 per month for savings account