Open2Cart.com — Purchase but not satisfied

Address:

Daman, Daman and Diu, 396210

Some day before I have received a call from open2kart.com. They told me they have launched new e-commerce website with payment tie up with payumoney.com. For your first order you will be eligible for an assured gift. and if you are not satisfied with our services. you can cancel your order any time. They made me purchase one item through his site. I made payment through payumoney.com. later they told me release payment through payumoney.com. I did. After my order I searched on Internet and found this is fraud site.and tried to cancel my order by calling these guys . But these guys are not attending
I am very sad but what i do this side.
Please sugess me.