My card blocked for unknown reasons

I cannot access my Standard Bank Internet banking profile and when i call in I've been told there's a hot card something on it and i need to go into a branch, she mentioned a temporary blockage on the card, so what i want to know is, if I don't know why there's a blockage and Standard bank customer care doesn't know why, why do I HAVE to be the one that's inconvenienced and go to the branch? Month end lines and traffic? This is unprofessional