State Bank Of India [SBI] — where's my refund?

Address:

72 Amit nagar colony deory road agra, Agra, Uttar Pradesh

Ordered an item from myntra of amount 1231 due to some issue i returned it.
Myntra has initiated my refund on 5may with reference numberrefund transferred - 110835733650469780203 [incident: in[protected]]
But sbi says their is no refund initiated
Sbi help team says no refund has been initiated by myntra and the reference number will not work
It's been more than 12 days i haven't received my refund.
Resolve my problem as soon as possible