[Resolved]  MakeMyTrip India — Convenience fee

Address: 122016

Website: makemytrip.com

I booked a round trip ticket to and from a destination i needed to visit.
The amount for the round trip flight ended up being 5049 inr.
I also opted in for the insurance they provided which was displayed as having a total cost of 249.
Now when you get to the booking page, they show a 'convenience fee'. I am sure it was more but when i go to my itinerary page, the convenience fee is 175 inr.
The total cost of my trip being 5691 inr (Fare-.5516, convenience fee - 175)
As a break down, i am giving the website the benefit of the doubt and assuming that this includes insurance for both my flights (To and from) which would be 249 x 2= 498, although they failed to mention this during booking.
So my fare jumped from what i saw as 5049 to a total of 5691 inr.
My question is: what is a convenience fee?
Nobody has even overcharged me for using my debit card before, and i would be very interested in knowing how many customers are being fleeced in this way.
I have looked around and have found no explanation for these hidden charges that drive up the amount the customer think they are paying. Granted, the total amount is shown by both the website and the bank (When they send the one time password to your phone), but usually a customer is "all in" by then and just chooses to pay instead of haggle over the extra amount.
This seems unethical and maybe even illegal.