Nykaa.com — refund of failed transaction amount of rs 600

Website:

Nykaa.com

I hav placed an order and paid rs600. Ref no[protected]igackplb on 22 nov 2017 at nykaa.com. I dint receive any order number with which i understood that transaction has failed but my account was debited. I mailed them and got reply that amount will be refunded in 24-48 hours. But after four days i didnt got any refund so mailed them twice on consecutive days but no reply. Kindly help to get my amount back...