Canara Bank — Refund amount is pending

Sir, i ordered a book from amzon and then cancelled it as i ordered the same book twice by mistake.they promised to refund the money.but i didn't get the refund amount.amazon customer care asked me to contact bank customer care.so when will i get this refund??the order number was #[protected]..
reference number for the refund is 74332747026702549245893.
my debit card no. is [protected]
Thanking you