********* business practice

I recently found some confusing charges on my credit card, I am being charged for some called "interest on cash withdrawel", while I do not draw cash or transfer money out of my credit card, spoke to a consultant last week, who advised me that I am being charged for payments I am making INTO my card. WOW, so capitec is charging me extra for paying my account? I requested the consultant to have a manager call me as I do not accept that answer, that is ********* BUSINESS practice. How can a bank charge me because I paid my account? to this day almost 2 weeks later, I havent heard a word from Capitec. Looks like along with everything else in our country Capitecs customer service and Ethics are going down the drain.