Ackermans Selling Faulty Phones Refusinf To Refund Customers

I bought a Jazz Android phone on Thursday 17 August 2018 I could not setup the phone nor install whatsapp my 70 year old mom took the phone to the branch in Bloemfontein Rocklands as it was for my daughter they also couldn't set it they sent my 70 year old mom to their other branch in town they also couldn't now they refuse to take the phone or refund. I want my money I can't accept a faulty phone it's their duty to ensure that their products are in working conditions