Bank Of India — Refund initiate by myntra but still not credited to my account

I ordered two different jeans from myntra one jeans amount 1559 rupees and other jeans amount 899 rupees on 1 dec 2021.And i returned the product to myntra and myntra initiate my refund two jeans on 10 dec 2021 and the promised date 20 dec 2021.And reference number of first jeans is 75105171345001368381106 and second reference number of other jeans is 75105171345001368335987 but still my refund is not credited to my account after working days of promises