Myntra.com — Refund not received Online Shopping

I have ordered Marks and Spencer pant from Myntra. The item was received but I returned it. Refund of ₹ 1, 124/- was initiated by Myntra on 19.11.2021. They send me my bank reference number, ie. 30001013241308130043750. Till today, the refund is not credited to my account. I contact Myntra many times, they told me that they already initiated and it was up to the bank from there on. So, what should I do now?

My bank account number is [protected] (Vairengte Branch)