Indian Bank — refund not credited for earphone purchased through amazon

Address:

E305 Agam Navkar Near Sachin Railway Station, _, Surat, Gujarat, 394230

Pravin rajbhar

Number:-[protected]

I purchased earphone from amazon on august 2019 and in january i requested refund which has been initiated by amazon but not credited in my bank account. Amazon gave my billing reference number:- yksi98m70000jyhi79wh, i showed to indian bank executive but they denied any kind of credit from amazon so amazon customer executive told me to file dispute form.
It has been 15 days but i haven't got my refund. Please solve this issue as soon as possible.