Panthershieldz — refund hasn't provided yet

Website:

www.panthershieldz.com

A few days before i have ordered a temperd glass for my phone for rs 500 through the company website panthershieldz.com. When it arrived it was not suitable for my phone so i contacted them and they told to return it though indian postal. Company has 15 days return policy too. I have returned it and even after so many days they haven't provided me the refund. So i called them again and again but they are not willing to even respond to it