How disgusting is their service. Selling damaged goods

Earlier in October i went and bought my pensioner mom a cellphone at the sterns store in Jabulani mall. We got there she chose the phone she wanted and the cunsultant took gave the phone to us, only to find out the cellphone was not working. She then exchanged the phone and gave us another one. She set it up and gave it to us. Told us that it was not neccessary to charge the phone. I dropped my mom off as we are not living together and went home.

My mom called me two days later to tell me that her charger is not working. I adviced her to take it back then she said she would. I however later managed to get to her house and noticed that the charger was not only working but that we had been given the incorrect brand. She took it back and they didnt help her one bit. They took her number and said they would call around but in the meantime she can purchase another one. To this day no one has made any contacts with us. The call centre also gave me a call to sell insurance and i advice that i was unhappy with their product and she said she would ask someone to contact me. But still no news. They have sold to us damaged products and they are getting away with it.