Unable to find fault on their own product

I took my car in for a service on the 23rd of February 2024, Collected the car on the same Afternoon Drove to KZN on the 24th and the car switched off while I was driving it. I took the car to Kia Newcastle, they can't find the fault. They need a similar model to be able to swap the parts and check if it's the main fuse. I have been waiting for 7 days now. It puzzles me that Kia has a product that they can't fault finding on without swapping parts with another customer's car