Pavers England — wrong product received; refund money still not received

I had ordered a pair of black heels from pavers england online from their official site. My order number was pe181331. I had placed the order on 7 th march 2019. On being my first purchase, i also got a discount.. The cost of heels was rupees 3500, i got it for 3000. Whn the finally arrived, which i paid through cod, i was aghast to find that the package didn't carry any heels.. It was flat object. It was most probably a wallet. I didn't even open the package thinking i might damage something, and it would be difficult later to return it. I tried to contact them in their official contact number, but no one picked up the phone inspite of repeated attempts. So finally in desperation i emailed them.. Finally they responded. They got the package picked up and after many email exchanges i got to know that the package had reached the original warehouse. After that they sent me a mail asking me for my bank details, so that they can initiate the return money. It was on 22 nd march 2019. After that i wrote to them repeatedly asking them to update me about the status of my return. But they simply would not respond or answer to my mails at all. Finally am approaching you guys for help