Consumer Redressal

I had booked two AirAsia ticket on 29th of November from Bangalore to Chennai for 20 December. On 4th of December I got a message from the airline stating that the flight went non-operational. On 8th of December Make my trip told me if I will cancel the ticket I will get my whole refund back from the airline so I cancelled the ticket. On 12th December airline people called and said we are joining your flight with the other flight but by that time there was a change in plan so we requested them not to join it and give our money back. later they told us we will get back the money after the date of journey gets over i.e. 20 December but nothing happened and since then we called the airline so many times and the only answer we are getting is WE DONT KNOW MAM WHY IT IS GETTING LATE, if they are only saying this what we are supposed to do then, almost a month is over and we dont have any idea. so many mails we have dropped but we are not getting the answer.