Myntra.com — receive defective product, return product quality check failed.

Address:

Tpep Pale Jowai, 793150

Return id - [protected]
Product id[protected]-4266003
I purchased nike air force one size 6 from myntra on the 16th september 2019 by sbi debit card, when i received the product it was already opened, the box was not original nike box, it was a simple cardboard box, there were no nike tags on the shoes and no paper wrapper, just the shoes and the carboard box, it looks suspicious, so i immediately file a return and i also tick the checkbox saying defective product. The delhivery guy came to pick it up and then i received the email (Attached below).
The product did not pass quality check, how would it pass quality check when myself i receive it in a bad condition, doesnt myntra check their products before shipping it, they should have seen themselves that the box was not a nike box and the way it is packed also look suspicious and the size also was too big,.
I want my refund and i do not want the product shipped back to me.
I had many successful returns from myntra, but this time it is very dissapointing and unprofessional.
There were no tags and nothing was there except the cardboard box and the shoes itself, i return everything as i had receive it.
I want my refund please, the shoes themselves cost rs 6495, for a costly pair of shoes i expect it to come with everything in place, but what i got was a little suspicious.