Paytm Mobile Solutions — did not receive the refund of my order returned

Website:

paytm mall

I did not recieve the refund of my order returned on 31/10/2018. The payment was made through cash on delivery mode. My order no. is [protected].
I tried to contact customer care via toll free numbers given on the paytm app but to no avail. Even I tried to email @ [protected]@paytm.com but email is not getting delivered . There is no way to contact customer care executives . Worst paytm service to its customers. Plz refund my money to my paytm wallet as soon as possible.