Consumer Redressal

I had placed an order for a prestige cooker on Paytm online shopping website on 28th July and I was promised delivery by 8th august. From the time the cooker was shipped, I was unable to track it and the tracking always said unable to load data. From then on, I have mailed them four times and have always got a response saying we will get back within 72 hours.but I have got no response at all.it was a prepaid order and I had paid 2000 rupees for it and now I have a feeling that I have been cheated and I will not get the product at all. What legal action can I take towards getting a proper response or to teach them a lesson?