Myntra.com — Refund not received since 23 July 2023

A refund of Rs. 1418/- had to be initiated on 23- July 2023 and in case of delay, it will take 7-10 days.
17 days have been passed since and I haven’t received my refund yet. Upon contacting the company multiple times, they have finally fiven me a bank reference number to deal with the bank myself.
Why am I to deal with the inconvenience caused by the company due to their negligent behaviour.