faulty stove and bad service

My mother who is 68years old bought a stove at Lewis in Modimolle for R7000 in January but only started using it in March after the renovations at her home, a week later the inner glass in the stove oven burst as she was baking. She informed the store and they said they would come collect and replace the stove and this was before lockdown. No one contacted her after that, when she calls or goes there they always say they will inform the manager. Lockdown came, now the store is open, she called the store but the manager still does not speak to her and one of the consultants there told my mom to wait for level 2 but what if level2 is next year, they seem to be delaying time so the warranty can expire.

Please help.