BharatPe — Regarding my refund that is not issued by them

I had purchased a swipe machine from bharatpe and used it for just 7-8 days only and i requested to return the swipe machine, Firstly I initiated the return request in the free trail period only but after return is scheduled i got the message that you cancelled the return pickup. But it wasn't cancelled by me. Then the very next days i done the same process to return the swipe machine and this time they picked up my swipe machine and assured me that they will return the money. while selling the swipe machine they told me that nominal charges will be charged when you return the swipe machine after 7 days free trial period. But even after returning my product in trail period they are not refunding my amount as promised earlier.They are now saying that no amount will be refunded in swipe machine when you return it. I mean to say that how it’s possible that there is no refund. Its a big amount of rs7080 that I have been charged for that machine. I just want refund for the product that I already returned back to the company .ie bharatpe, i have also called lots of time to the customer support but they were refusing to help. Please help me . I feel that i have been cheated by bharatpe. I have been scammed by them. Please help me.