Amazon India — epidemiology made easy by poornima tiwari

Address:	Guntur, Andhra Pradesh, 522503
Website:	Amazon.in

I bought a book named “epidemiology made easy by poornima tiwari”on 23rd march 2018
I paid by debit card ₹400.
Then i received an email that the order got cancelled on 28 th march 2018 because the seller had to cancel it because he did not have the book.
But i did not receive any email about the refund. I beleived amazon and waited till today (15th april 2018). But now i am not able to reach the customer service whatever i do.
They don’t have a mail id for customer complaints. And when i opened my orders, it doesn’t show the cancelled orders and if i filtered it to cancelled orders, they don’t give any options to complain and we can only view the order. When i viewed the book again, i can see a different seller (Previous one was naveen book seller and now sunrise book store). That is why l approached this website.
Kindly help me get the refund.