Makemytrip - Ticketing Refund due to Visa Refusal

I booked an Lufthansa international flight ticket through MakeMytrip from Delhi to Berlin on **st December ****, but was unable to travel because my Schengen Visa application was rejected by the Germany embassy. When I contacted MakeMy trip and sent them the visa refusal letter before * days of my travel date, they state that the refusal copy is not stamped by the German embassy therefore will be unable to process the refund as Lufthansa is not accepting the letter.
When i contacted Lufthansa and sent them the visa refusal copies because i also booked the additional seat reservation through there website, they state that the seat reserving refund will be processed once make my trip cancels the flight tickets and processes the cancellation.
I sent the same visa refusal copies that i received from the Germany Consulate in chennai, When i contact them they say that the letter from embassey has its monogram and bar-code scanner along with the transaction number and date. As per the airline and lufthasa policy i am entitled with full ***% refund of both my flight and seating tickets.
Below are the details of my ticket details. attached are the copies of my visa refusal letter along with passport.

Kindly please help

Lufthansa Booking Code : UJF*XJ
Ticket number : *************