MakeMyTrip India — hotel booked for 3 adults was auto selected to be booked for 2 adults and 1 child

I booked a hotel in Indore through the app by making the selection for 3 adults. When i went to the room selection page the 1st option said 'recommended for 3 adults' and at the bottom was the total amount with the caption 'for 3 adults' with the facility of 'quick book' on which I clicked and made the payment. Just before 1 week from my trip when i called up the hotel they said the booking is for 2 adults and 1 child and if the third person coming with you is an adult you will have to pay 1000+gst additional for each night.
I rechecked by making the same settings of 3 adults again and tried to select the room for the same hotel again just to find out where did i make the mistake.. i found out that everywhere it is written in bold that the booking is for 3 adults even where the app was making the recommendation but there was an extremely tiny drawing of 2 blue adults 1 pink coloured small person in the middle which was put there to make fools out of people. Even where the quick book option is given with the amount, that was also saying 'for 3 adults'. That was a confirmation that it was not my fault.
I contacted customer care multiple times, i sent them screenshots of the booking page multiple times but they keep transferring my case to different departments and everyone comes to only one conclusion of paying the extra amount.
One of the customer care executive who tried the same booking through the app on my request by following the similar steps i following agreed on call with me that I am right, this is a technical fault from the app itself. That recording of the conversation would be available to MakeMyTrip as a proof as well. But since the day he agreed that its the app's fault I have not been able to speak with him and he has not contacted me too.
Every other person who contacts me from MMT is trying to prove me a liar and keeps asking me to pay the extra amount.
This is extremely unacceptable behaviour and high level fraud. I have screenshots that prove I am right and i didn't make any mistake while booking.