Hyundai Motor India — Fault car, suddenly engine getting stopped

This is to inform you that i have purchased a venue sx on April 2022, considering the quality and reliability of Hyundai vehicles, but at the time time of delivery itself inside the showroom it got some fault later which was taken care. Somehow the convinced me and delivered the car, after the month of purchase covering 3000 km. I was travelling with my family on highway car suddenly stopped in between highway whith out any check signals and car was not getting start, somehow i managed to control car and stop it. I contacted RSA which took more than a25 hr to give service, my whole family war there having no were to go wating for it. Once it reached service Center They told that your catholic converter has been chocked. i told them i am will aware of DPF issue in BS6 Car and i regenerate it frequently to avoid it, as per my knowledge dpf or check engine light will glow in that case but there was none of warning signals, which i told the SC and Shales executive but they didn't accepted it.
i told them that i will not take this car back as it is very risky and life threatening for my family to again use this car in hilly region as it gets stopped suddenly and once engine is off brakes and steering don't works.
After month of discussion with Sales and Service section they convinced me that it will not happen again as the ECU and this that has been updated. I asked them the written assurance which they denied saying we are giving our word if it happens again we will be the responsible for it and will proceed for replacement of vehicle. Believing them i took the vehicle, but as soon I took vehicle and driving it for 100-120 km dpf light showed off which lasted for one week until I went to SC again. NOW again on 18/09/2022 while I was taking my vehicle for Vishwakarma puja, i stopped suddenly. Just imagine a middle class person buying a car with hard earned money and loan on his head gets this kind of problems frequently, it becomes very painful and unboreable sorrow .Now i demang of total replacement of car with same model as soon as possible. or i will fight legally till i get the replacment or i die.