Exorbitant Hon Fee

I have just switched to Nedbank Professional Banking as of November 2017. I received a credit card with this package, which I used and paid off regularly. However, this month I was just debited for the entire outstanding amount on the card without being informed and this lead to my account going into the negative figures. The same day it went into negative, I transferred the relevant amount in order to bring it to a positive balance, however I have been charged R90 x 3 = R270 in "Hon Fee". This is ridiculous, this is the first time I ever had a credit card and I was unaware that the ENTIRE outstanding balance will come off my account. Furtheremore, when this debit went off, the monies were transferred immediately into the account to bring it to a positive balance. I am VERY unhappy with this Hon Fee and would like a full refund of this R270 from Nedbank as I was not made aware that this debit was going to go off for the entire amount.