Air Asia — charged me more on the name of pre booking

Address:

New Delhi, Delhi, 110049

Hi, I'm Dr. Gagan Banodhe. I booked a flight from New Delhi to Goa no. I5 773 dated 6-11-18 7.50 pm. A call came 3-4 days before journey from air Asia customer care executive and asked me to book meals so I booked two meals one veg and one non-veg on total of 800/- but in flight it was available in 500/- total. So I want me you to refund my balance otherwise I will file a complaint in consumer forum about it.