Skullcandy — Refusing to give refund

Address:

201, 2nd Floor, Chandra Bhawan, 67-68, Nehru Place, Delhi-110019.

Ticket No:[protected]
I place an order on 18th July 2023 and completed my payment. On 19th July 2023 i requested for cancellation of my order and provide me my refund. As their cancelling and refund policy is mentioned in their official website which promisses refund in 7 days if order cancled before dispatch. Which is my case.
I got confirmation from support team that my order is cancled and my refund will be provided within 10 to 14 days. And after 19 days the support team is asking me for a valid GST invoice to process my refund. Which was not provided to me by Skullcandy in any stage of my purchase and cancellation.
I did send multiple emails with screenshots of my purchase and transaction, with payment transaction number and ticket number. But they even refuse to reply.