Poor Service

good day,

i booked my car with Toyota Woodmead twice for the same issue 2 months back , my car would show hand brake light and steering light while in motion,the steering will become stiff and everything goes off after parking it not starting at all. on the 02 September i experienced the same issue again and decided to try a different dealership. Now they don't have a certain part and will only be getting it on Thursday. i think Toyota Woodmead could have found the fault back meaning there's something they didn't check properly and all this happened while my car was still under warranty now i have to R2800 for this service. My problem is what if i experience the same issue again and they come up with a different fault then i have to pay. At 1st they said the battery, i changed it then second time they spoke about no enough power from alternator to battery now at Toyota Midrand found a different fault. Day 3 now car-less and they will only be getting the part on thursday.