Indian Bank — refund not reflecting in account

Address:

S-7, FLOOR, GAMMA SHOPPING MALL, SECTOR GAMMA, GREATER NOIDA 201301, Gautam Buddh Nagar, Uttar Pradesh, 201301

I had purchased a cloths from mantra on 21/12/2019, paid for it through indian bank debit card and order didn't placed but balance deducted from my account. Myntra initiated refund in same day. The maximum date for the refund to be processed in the account was 31/12/2019. I contacted the bank and gave them the refund reference number but they are not providing me the required information.
What do i do please help.