Reserve Bank Of India [RBI] — Refund not reflected in my account

Dear sir, I cancelled an order of rs 10990 on Amazon on 16 feb 2021 and refund was initiated by amazon on the same day. It should have reflected in my account but it hasn't been reflected yet. The amazon is saying that refund is credited from that side and as a confirmation Pnb has send them the reference number which is 30005110471047118372986 but the bank is saying that no amount is credited. I think that the amount is stuck somewhere in the pnb server. I request you to track it with the above given reference number and get it transferred to my account. Please I need that amount for my urgent fees submission.