Air Asia — tax refund

Hello,
I am writing in regards to the refund that the airline have to do after the government order reducing airport tariff by 89 per cent applied on july this year to flights from delhi airport.

Booking number upez2k
Booking date: 30 aug 2017
Flying from: new delhi
To: kuala lumpur
Date: wed 04 oct 2017 at 2310 hs.
Passengers: leonardo wortzman
Carolina cuny

Please if you could provide me information how to proceed with this claim.
Thank you in advance.