Myntra.com — Wrong product delivered by Myntra and of different brand

This is regarding the wrong product
delivered.
I have raised the concern on the same day of delivery i.e on 14th dec. the product I have ordered is Octave men track pant but instead of it I have received a shirt of different brand .

I don’t know this mistake is done on whose end.
I got a response from Myntra’s team that investigation is done and we have delivered you right product.

But I have already told them many times that this is not the case and may be delivery person or someone has done this fraud because the package is opened and re pasted with glue

I don’t know why I am not getting any resolution from their end and refund for my paid amount as we are purchasing from Myntra so it is their responsibility if the fraud has happened why should a customer bear any loss.