Gawa ng video. Maganda naman siguro phone ng misis. Any video will support your claims.
Report to head office immediately. Which particular vehicle is this? Take the names of the SA and mechanic who touched your vehicle.
This could be fuel quality issue. Which gas station did your wife fuel up with? Is this a petrol or diesel engine?
Safety issue yan pag namatay engine. No brake assist whatsoever.
Remind your wife, hazard light on pag namatayan.