Since the car refused to start anymore after stalling, I believe the engine has welded itself beyond normal repair. Full rebuild is expensive, swapping engine can be a good remedy. Expensive to pay for being insensitive. You can feel and hear the engine before it welds itself.

this is WHY u should service at SC for at least the 1st 20k KM
not only to see what they change during the course
this will also to make sure that your car's engine and GB have no problem
and other part that faulty during that period also can be replaced for free
AND THIS APPLIES TO ANY BRAND OF CARS

If you need the car fast, just swap the engine, but not sure what's the price/where to source.

For preventive action, check the car weekly during weekends, to observe the coolant/engine oil/transmission luid/power steering fluid/brake fluid level. Send to service center/workshop (if lazy/don't know how to debug/fix) when seeing abnormal change.

Err... no engine oil indicator/warning in saga flx?

no engine oil also can start one,

but with more internal damage,

just see underneath the car and spot where the exactly leakage place.
or maybe post some picture..