EaseMyTrip.com — Charged extra amount

I booked a flight ticket on Easemytrip.
The final bill amount said 16057.
I was charged 17057.

The app said 16057, even AFTER the booking was made and showed that I had used a promo discount code.

However I was charged ₹1000 extra and on contacting customer care multiple times, I have received the same email response saying prices are dynamic.
The booking was already made and paid for. App said 16057. So prices being dynamic is not the reason. My coupon code benefit was not provided even though it can be seen in screenshot.

This is fraudulent. I was getting cheaper ticket on other platforms like MMT, Yatra than 17057.

I was shown the price 16057. But then charged extra.
And thereafter being mistreated and literally harassed by customer care where I've called multiple times but told every time that I will receive email response. Which is the same copy paste message not even one word change, saying price is dynamic.