Amazon India — refund is not get

I have ordered three items(powerbank, headset, memory card) on 20th Jan 2019.order I'd[protected].on the very nextday[protected]I order was cancelled by me because of lag of time.in the above said products, payment of memorycard was refunded.refund of headset was issued on 22th jan and powerbank issued by 30th Jan.but I didn't get refund.when called amazon customer care they replied that it was refunded.they have also send that, if it was not refunded properly contact with bank.bank officials(sbi) said that any transaction were happened.
I have a fruitful relationship with amazon app.I through the regular customership.but these kind of insufficiency in your service.will make problems to your customers.hence kindly may refund the payment of the products orderd by me.
Athira gopi