Amazon India — Refund not showing in account for a returned order

I was ordered a book name mathematical analysis by s.c.malik and savita arora, worth Rs. 450, dated 19th of october 2020.After delivery of the book, due to some problems in the book, I returned it to the Amazon. Return was accepted at 22th of october 2020.and they also issued my refund to my account, which I get to know by an email, which was send to me by Amazon india. The problem now is sir that the refunded amount is not showing in my account till now. (30th of october 2020 at 8:26 am). Please take some necessary and immediate action my this serious issue. After the problem gets solved. I will be thankful to you. The time limit which was given to me has passed on 29th of october 2020 at 12:00am