American Swiss very poor and dishonest service

I went to buy a phone at American Swiss by Rosebank Mall and their treatment was something else!! So the first thing I selected the phone I wanted to buy they then they took the one which was on display to sell to me and I asked them since it's a phone on display is there any discount that I will get because basically it's not really new because it's on display like a demo , the lady told they don't offer any discount at their shop and if I'm not happy I should go to another shop. But because of time and being used to buying in that shop said it's ok they can give the phone. I was even more shocked on the display the price was r1299 then when I was about to pay they changed the price to r1599 and I asked why the Lady told me with an attitude that that's their price not the one on display. Then she said Vodacom it's expensive etc . I regret going there ever I went to Eastgate game shop I bought my phone no stress or that attitude. I'm was not happy with their treatment.