Paytm — Order not delivered and no response of several emails

I ordered a product on the 13th October, 2014 from paytm.com. It was supposed to be delivered by the 23rd October, 2014 in Howrah. I didn't received my product yet. I wrote several mails to paytm but they are not responding. I paid n advance for this product. Now I want to cancel this order and need my money back but there is no cancel button on paytm website or android app. Please look into this matter and take required action. Regards, Sombir Singh