Wait for few more days. If the refund is not credited to your account, than contact Registrar of the Issue -
Karvy Computershare Private Limited
Karvy House, 46, Avenue 4, Street No. 1,
Banjara Hills, Hyderabad - 500 034
Andhra Pradesh, India
Phone: +91-40-23312454
Fax: +91-40-23311968
Email: einward.ris@karvy.com
Website: http://karisma.karvy.com