Punjab National Bank [PNB] — regarding refund issue form amazon

Address:

19, krishna bihari nagar verma chauraha, Barabanki, Uttar Pradesh, 212601

I purchased lehenga choli from amazon and due to some defect i returned it, i receive the final mail from amazon on[protected] that your refund is processed from our side and if amount is not reflected in your account within 4 working you can contact to your bank with reference number provided by amazon, i called to to pnb customer care but no one help me regarding my refund issue. Amazon processed my refund on[protected] but still it will not reflected in my account and guide me to fill the charge dispute form.