FNB Has been charging my account over R2640 in 3 months, over and above account charges.

I am experiencing a problem with this account. FNB has been taking away my money without my consent. My account went to negative and I was not aware, taxify and uber transactions of about R20-30 which can be over 3 transactions go on my account, while it is on negative. FNB charged me over R660.00 for 3 transactions this month, and I noticed they did this in Jan and December. I was not aware this money ******ion behavior from this bank. I need this money paid back to me. This is not part of my agreement with them. I however will understand a reasonable charge for honoured transactions on my behalf. I need my money back, all this amounts to over R2640 as far as my calculations are concerned. I mean R2640 of charges excluding normal bank charges which are normally around R300 a month. This totally wrong and day light *******