Paytm — 10.5K Amount stuck with paytm

Address:

Guntur, Andhra Pradesh

I have purchased a mobile from paytm under and offer of 15% cashback into paytm wallet.But after receiving the phone when I enquired about the cashback they told me that I didn't applied the coupon, so not eligible for cashback. I am sure that I have applied the coupon and also given the couopn code that I have applied also asked them check their system if there is any mistake. I also informed them if you cannot provide the cashback them arrange for the reverse pick up of the product. But its been more than a month, there is no reply from them. I have tried to contact them via emails, facebook but all went in vain. I finally decied to approach a consumer forum as this the only place left that can help. So please help me in getting my money back from the cheaters.