FED Up !! BAD SERVICE NEDBANK!!

How difficult can it be for Nedbanks call centre to understand me!! For the third month in a row they are deducting double amounts a week for a personal loan instead of one! After noumerous reversals from my bank(which incidentally shows bad on my account), two phone calls, emails, they are still taking double amounts!! Am i paying someone else's account or what? When i complain, it goes well for a week or two then its back to square one. Today I tried to go and see the bank manager, but she was out on a meeting. No problem the lady told me, leave your contact details and she will contact you. Jokes on me, still waiting for a phone call. Guess it's money in the water, because Nedbank dont see this important enough to get back to a client!! NEVER IN MY LIFE AGAIN!