Poor customer service

I bought a stove at OK Furnishers, Witbank downtown on 18/05/2022. Due to time constraints I couldn't managed to use the stove until 22/05/2022 when i realised that the stove is faulty. I phoned the shop to let them know of my problem and the lady who assisted me when I buy the stove asked me to return it on 24/05/2022 for exchange.

Today she called me but we couldn't talk due to network problem. I told her that I will call her at 16:00 to make an arrangement since I'm working far. I called but they said she went out. I left a message for her to call me.back but she didn't call until they knock off at 17:00. It seems they are just trying to push the 7 days so that I wont be able to get exchange.