Spinny — Car Took from Spinny Had Severe Issue

Very recently we took the SPINNY ASSURED vehicle from Spinny and had the worst experience
We identified a MAJOR PROBLEM in the vehicle.

When reaching above 80kmph speed in top gear, There was an AIRBAG symbol on The dashboard and the Speedo meter reached 180 ( absolute END) position and the Engine is getting stopping. The power not reaching to Engine.
While we driving on Outer Ring Road ( max speed limit 120 kmph) after
attaining to 80kmph suddenly the car slowed down in the middle of the Road, We Panicked at the Situation and it was very difficult to move the vehicle during that time from the center of the Road to the left end with this Slow-down car.
We Scared a lot with that Situation.

However, It’s completely missed from Spinny's side. I was surprised how this issue was not brought up during its Plenty of Checks.
Again, during the test drive - Spinny was allowed only to drive in the Basement (parking area). So the issue is not Brought up. It has been many days since we reported the issue and Till now we haven't received any Resolution.
Every day we are getting calls from Spinny but Nothing progressing and resolving.