SAA BAD SERVICE

I was booked on a 12:55 flight to PE on 28/08/2015 and the flight was overbooked, when I couldn't get a seat after being placed on standby I was told to return to counter 53 at check in to get help. when I got there Mandy was on duty, I did not stand on the queue I went first to ask if she was the relevant person to talk to so that i don't waste time waiting on the queue she firstly ignored me then when I asked again she started being rude and telling me I don't have manners and she was very rude and started talking about me with other customers which I found very wrong. Then Sharon came to assist she started with bad attitude because Mandy told her I didn't have manners. Then asked to see the manager she said she was the supervisor. I really found their conduct as customer service agents disturbing. I couldn't get Mandy's name on her name tag and I asked one of the ladies at another counter and she told me its Mandy and used to being like that as there's a few times where people complained about her and she's new. Such bad service is not good at all. I am really disappointed.