Ajio — refusing refund of the order not placed

Address:

Thane, Maharashtra, 421201

I had placed an order on 14th of august 2018.
Due to their own internal error on the ajio app, order didnt get placed but my amount got debited from my account.
Now they are refusing to refund it and giving me the whole responsibility of their mistake and telling me to communicate with the bank.
This is so unprofessional and frustrating.
It has been the worst experience shopping there.
I need refund from you asap.