Canara Bank — transection

Address:

Hudko police station behind krishna Chowk dipti nagar 3 5 corner kothariya road Rajkot, Rajkot, Gujarat, 360002

I have purchase envent beatz earphone in amazon rs.439 cash back 100 total amount rs 330 payment option debit card. But this product is return and amazon pay refund data 3 april but canara bank not credited this balance in my account.
Canara bank says this amount is allotted 4/5 working days but not credited amount in my account and not clearly answer this problem.
Please action canara bank