Bad customer experience

I bought hyundai i20 motion in December 2021 from Hyundai The Glen. The navigation system was charged R10 000 inclusive of vat. It was not working and I made them aware.

The advised I should bring the car in January so they can try and format the SD car, I left my car there for the entire day upon getting my car I was told they were unable to format the card and the will have to order the new one. I kept on calling them to check how far are they with that and they claimed that they have ordered the SD card overseas and it's difficult to get them. Yesterday calling in and I told to bring the car again to they can try to format the card. I mean they failed last year. I have waited for the entire 12 months for an SD card so that I can enjoy the privilege that have been charged on my car and that I am paying every month