Myntra.com — refunded my money into a dormant account by their own technical glitch and now denying any support regarding the same

Website:

www.myntra.com

I returned few on items ordered on myntra this week and 3 of them were cod orders. Now, in myntra app you get option to choose the source where you want your refund amount to be sent, in case you have two bank accounts, you can still chose in which one you want it. I chose the one i have been using for every transaction with myntra since past 2+ years. But myntra initiated the refund to a different one mentioned there and it has to be a technical glitch from their end, since all these products i returned weren't in the same order but each one had a different order i'd and hence, it's not possible for someone like me to be that ignorant thrice because i have been a online shopper on myntra since 4+ years now and i am already aware of it works. And, also taking this into account, why would i choose a dormant account 3 different times for 3 different orders when i know the other account hold balance in negative and in no way i can withdraw it ever again.
All of their executives have been the worst ever people appointed for customer care, since none of them even tried to understand what has happened here.
I was told, i should have deleted that account if i wasn't using it, but in no world: neither in their app or website, can i see where my bank account details are saved, i explored everything and i mean everything. They said, it should be visible in the saved cards section and not once, but by 4 different people, but it still isn't there. So, that just shows that they haven't even given that visibility to their customers, whose bank account details they have kept with them which is too sensitive and confidential.
And still, they are denying any help or refund.
I have been a regular and loyal customer of myntra and have loved them till date, but this has broken my heart and even my pocket, since the total refund was around rs. 1900/- which is not a small amount.
If they look into in sensibly, they would realise, it doesn't even make sense that someone would make the mistake of selecting a wrong bank account for 3 different return products with different order ids.in no world, would someone be that stupid.