Waitress Reprimands Customer for tip given

On Tuesday 15 June 2015 I went for dinner with a friend to Q.ba in Greenstone. After having paid the bill and walking out, the waitress, Candice, handed me change saying that I should give it to the car guards as they need this more than she does. Not understanding, I asked her what she was on about and she informed me that we had not paid a 10% tip. A complete miscalculation on our side but the attitude in which this information was relayed was completely unprofessional. Should Q.ba require 10% tips given without people making honest mistakes, then they should add this amount to a person's bill. I will never go back there again!