Hyundai Edenvale dissapoints

My car went for a service on the 7th of January 2020. On Tuesday 11th our car started having issues with rough idling and misfires when in lower gears, we took the car in and they said it was sorted as they did an ECU update. We drove home and within 2km the problem started again, we phoned Hyundai and they said to bring it back, we were planning on taking the car the 13th but our car would not start. It swings but doesn't turn over, we had to get a towing company to take it to Hyundai. This all was at 9this morning, we haven't heard anything from them yet so I phoned at about 12:30 and the car hasn't even been looked at. I am very angry about this as the person we dealt with knows we only have 1 car and this is our only means of picking up our children from school and getting to work. They didn't even let us know what is going on.