LittleApp — amount of 840 deducted but didn't get the tickets or money refund

Website:

Little app

I paid ₹840 for a ticket to water kingdom in 30th april, 2018, mumbai but i didn't get the ticket.
Money was transferred successfully from bank account to paytm then deducted from paytm.
Little app showed something like - there happened some problem, money will be refunded.
Still got no refund.
Even no customer care support.
Even they are giving invalid email id in their 'email us' tab in app.
Please help me getting the refund of ₹840