Syndicate Bank — i have not yet received the refund despite rrn being generated

Address:

Amazon

Good morning sir/madam,
On 11th april, 2020 i had placed a prepaid order of a few products on amazon amounting to rs. 1511. But on that day i had cancelled one of the products amounting to rs. 401. I have not yet received the amount in my account. I had contacted amazon and they informed that rrn is generated only when the refund initiation successful. The rrn is 120360. I had contacted the customer care of the bank as well as the home branch but they failed to address the issue. Please look into the matter and provide me with a resolution at the earliest.