Refund not received from AskmeBazaar

i had placed 6 orders of 5000 rs Make my trip gift cards on the 13th of April i guess it was a pricing error they were selling it for 3800 that entire day out of 6 orders 4 were paid through my Ola Money account and the other 2 were paid through payu and Mobikwik

other than the 2 orders i have not yet received the REFUND for the 4 orders Paid through Ola Money which totals upto 15,200 today is the 15th of July more than 3 months im frustrated please tell me what to do