Ask HN: No response to refund reminders from Fancy.com. What should I do?

I've ordered an item from Fancy.com and seller canceled it because they don't ship to India. But, even after seller canceled it, I didn't get my refund till date.

For reference, I placed the order in November and seller canceled it next day. Since then, I've been emailing them, tweeting them but they aren't replying.

Any idea where should I file the complaint or what should I do now?