Myntra.com — item not delivered but got a message says it's delivered

I ordered a navy blue jeans on 27th may 2019. On 30th may i got a message saying that the item was delivered, but the item was not yet delivered to the given address. I called mantra customer care and he says he raised a complaint and i only get notified in 8th june and i wanted the product before 5th june. I want refund because i ordered the item for a function and it is over now. So i want refund. Please help me with this.