Poor black business conduct

I have bought a computer box from Ernest diagnostics on the 25/10/18 for R1500 the box started the car the first time we got to the house and when we tried to start again we could. The lady working there told us to bring the box back together with the with the car we did as per her instructions they fixed the box and told me it was because of the battery that the box died I then bought a new battery to avoid the box being damaged again but irrespective of that the box still died the very same day. We informed them and again they said we must bring the car in but I refused because the car is being towed I paid R250 the first time it went there the costs that the boxe is costing me are too much we then agreed that they will refund me. The most annoying thing about it all was that for me to be refunded I need to wait for them to sell the box first then they will refund me. We have had a few word exchanges with them because the treatment and the conduct they are using is not inline with consumer act. The lady has even sworn at us with attempt in reaching an agreement with her, she wants me to go by her rules of how and when is she going to give me my money back. She has concluded that I will be refunded only in January and she is now in possession of my box that I refuse to be given another 1. She even told me that do I expect her to stand outside to sell the box and I might have damaged the box myself. With them having my box for the past 3 weeks I was the 1 having to call them and get an update she would swear and be rude that I’m telling how to run her business

Overall everything that has happened I’m frustrated by all this because I don’t have a car, I’m suspended from work because I couldn’t arrive on time and I won’t even be able to be on time for my hearing because she is on a power trip and the husband being Ernest doesn’t want to get involved in the matter.

Their number is ********** 748 ********** 005