Rude manager

I was shopping at Clearwater Mall and visited the Truworths store. We selected various items and moved to the cashiers to complete the purchase. We waited for more than half an hour before the next person was called to a cashier. The manager and 2 cashiers were busy with clients respectively attending to returns and cared less of the que that was now building up. The apparent reason was that they experienced some software challenges, which was understandable. When it was my turn, I called the manager to query the reason for the delay and received a very abrupt reply. I then requested for the managers name and surname and she advised her name as Portia with no surname. Upon me requesting her surname, she rudely advised that she is not allowed to give her surname. I was taken back by this manager's lack of customer service in simply supplying information requested from a customer. PLEASE CAN TRUWORTHS LOOK INTO THIS AND ADVISE IF THIS IS ACTUALLY YOUR PROTOCOL.