overcharged Service fee & interest on the 28/10/20

I have been bank charges twice. The first bank charges went off on the 26/09/15 which is normal on my account. The second bank charges went off on the 06/10/15 which resulted in my account to go in the red.<br> This has been corrected a week later or so.<br> On the 28/10/2015 the normal bank charges went off but in addition Nedbank charged me interest and an extra service fee for being in the red.<br> I phoned about that and I was being told that I have to go to the nearest Nedbank with my id to sort it out??<br>