For that, i had raised a refund request. However, the author has not refunded yet. I have been trying to contact him through envato as well as their support forum. But they are not responding to my requests.
This is not the right place for requesting a refund.
If you have contacted support then wait. Refunds can take up to 5 days. If you did not receive an answer, you will be able to escalate this to Envato support.
As my colleague @Typps stated, you can escalate a dispute with Envato. If the author doesn’t reply simply open a support ticket with Envato Help and Support and they’ll gladly help you out.