Bad customer service

I saw an adverti*****t on edgars website of Nokia 3 with feature-dual sim I went to the store bought the phone even the leaflet inside states that it is dual SIM. I inserted my first SIM when I wanted to insert the second one I couldn't find the slot for the second SIM. I went to the store where I bought the phone. Edgars Active Bloed Mall, got there qued at the cellphone counter. While we were still on the que with my friend Phumzile the cashier who was busy with another customer asked me if I wanted a phone and I said no I've got an inquiry. When she's finished with the other customer she asked what was wrong didn't even greet us I told her that the phone doesn't have a second slot for the second SIM, she said "who said Nokia has dual SIM?" They don't have such a phone I shown her the ad then she called Bongi the Admin who told me that they don't sell such a phone and gave me the number of some guy who's working for Nokia and head office number for me to call because it was not their fault. The cashier didn't not explain nicely to us she was even laughing and called the other staff member Caroline she came and laughed with her. I asked Bongi to let me use the shops phone to call head office then she said we going to finish the shops airtime. She said I must buy enough airtime to call their head office department they not even going to help me.