If you are eligable to get a refund then you can request for refund. Can I Get A Refund is an explantion of the refund policy, requirements, process and a button linking to the refund request form.
I applied for a refund but the seller has not responded for 3 days.
if the author does not respond to the refund request within 7 days, you will be given an option to raise a dispute with Envato. This option should appear automatically as a link or button on the refund request details page after 7 days.
my job is a little urgent. so I need to get a refund now
This is public forum here we can just send you to the right track so that you can get help/guideline.
you can check
How do refunds work?