No tact and manners

I've allways payed my account, and low and behold I go to an end toll booth at Centurion and ask if my account is clear, no you must pay R300. 65 plus minus, and when I ask them but every time I'm here asking you if I need to pay anything you say no, now I must pay there answer was it was not on there system then. I would like to say the worst client service ever, lying down not really wanting to help, don't no what to say, really just no service just a real money making sceem really no client service these people should not be aloud in the public because it's a real desgrase to have people like this serviceing the public, NB I no nothing is going to be done about this.