Tata Motors — Fuel pump fault

I have purchased Tata tigor xt in 2018.
After one year it start giving problem.
On long route the car stops accelerating properly and starts jerking.
I complained about this in sagar motors during the service time, they told me that they solved the problem.
But again on long drive the car starts jerking and not accelerating properly, i again told them at the time of service,
But not get positive response.
Now the problem is still happening, and now they are telling me to change the fuel pump .
But now the car is out of warrenty,
But my point is that i have complaint about it when my car was in Warrenty.
Please i request Tata motors to change my car fuel pump.
I also check about this problem on internet, and i get to know that most of the tigor and taigo are facing this problem. Please change it as it is manufacturing defect and i had complaint it during warrenty period.