Very rude check-in counter lady

After a week of refreshingly fantastic service from people in various environments throughout the Cape Town and surrounding areas we visited, we experienced a completely opposing level of service at Mango's check-in counter at Cape Town airport. The check-in lady was abrupt, distracted, did not answer my question as to the reason why 3 of us could not be seated together - although this was not a problem I wanted to know why for future reference as we had not checked in late - she snatched our identification documents then snapped for the missing one which she already had. She then slammed our boarding passes on the counter (still no explanation for the seating issue); I then noted that one of 3 boarding passes was missing a baggage sticker, and I had received a boarding pass for a fourth person unknown to me. When I pointed out to her that there were 3 of us and I had 4 boarding passes she snapped back and rudely demanded first that I give it back to her, then secondly demanded that I give everything back. There was no please whatsoever. When I noted the lack of \please\" she asked if there was a problem. I indicated that it looked like there was, she suddenly became apologetic."