Not honoring Guarantee

We bought an Aim 50 inch TV at your Cape Gate branch, model number cz 1850 on the 29/08/2020. Almost 3 weeks ago while we were watching, the screen just went black. We took it into your Cape Gate branch, as it is still under guarantee. After 2 weeks I phoned them to find out what happened as nobody contacted us. I was informed by Johan that they need the standing feet of the TV and that they will refund me the original amount we paid and not replace my TV, as the TV apparently cannot be fixed.

This is totally unacceptable, as the current prices of a 50" TV is about R5000+ and I cannot even replace the TV for that refund amount. How can you give a 3 year guarantee if you cannot even fix or replace it?