Amazon India — Regarding refund amount rs 849/-

Address:

India

Hello sir., recently i returned an purchased item on dt: 7.6.2020 to the amazon india service. After that i got an "refund reference" no: 75503720161040253476434 to my registered mail id.in that it was mentioned the amount will be credited with in 3-4 business days, but it was not happen yet. I even spoken with indian bank customer care service, they said they are helpless. Based on these reasons i am complaining "charge dispute". So please refund my paid amount to concern bank account through which i have done my pay via online.