Myntra.com — Refused to help regarding my refund money

Website: www.myntra.com/online/shopping

I was supposed to receive a refund amount of rs. 1214 from myntra which was initiated on 10th December 2021 but it has not been credited to my account till now (31st December 2021). Myntra has provided me a reference number and I contacted my bank support team with the same number but they informed me that there is nothing with that given reference number. After that I have contacted myntra again and they are saying the same thing again and again. Myntra also asked me for my bank statement which I sent them and then they said it was not asked it was a wrong information given to you. This is highly unprofessional and disappointing. Now they are denying to resolve my issue.
Kindly help me in getting my refund money.