FNB Cash Deposit Fee -- Complete Ripoff

I have a Gold Business account with FNB. I've just seen on my statement that a client paid R45 cash into my account, and the bank then charged me R48 Cash Deposit Fee! THIS IS ****************! The monthly service fee of R80 is already high, but a Cash Deposit Fee of *FORTY EIGHT RAND* is an insult. Please don't tell me that it costs that much to count and handle cash! For a R45 deposit, to then charge me R48 ??? Disgusting.