Paytm — Payback cash amount never received

Address: Kolkata, West Bengal, 700107

Website: paytm.com

As per my order number [protected], i have applied promo code of sh31, for which i should have received a cashback amount of rs1510. When i transferred that amount to my bank account via paytm wallet, it never reaches. The transaction id provided by paytm is a fake. My bank is not at all aware for any such transaction. Paytm is not taking any responsibility and simply harassing me over mails. The transaction date was on 04 mar 2016. And its been 2 months that i have been harassed. Please help me to resolve the issue asap.