If refund is still no done then write a mail to samsung shop support: email@example.com
Dear Samsung member,
Greetings from Samsung customer support.
We acknowledge your query and apologize for the inconvenience caused to you and will surely assist you regarding the same.
We would request you to kindly call on the concerned helpline number, the concerned department will definitely resolve all your queries 1800-5-7267864/1800-40-7267864. Kindly press option 3 for the Samsung shop..
Thank you for writing to us.
Samsung Customer Support.