StashFin — even if I paid the emi amount through bank transfer they auto deducted the same amount again

Hi,

On 22nd April 2019 I had received a message from statshfin that EMI of Rs.
8357 has not been honoured. So I have had made the payment instantly.
through there app. After a few minutes, i could see they auto debited the same amount from my account again.

So in place of paying 8357, I had end up paying 16755.

When I called there number I was getting absurd answers that now it is very hard to get the money back, it will take long time.But they were not telling me when I am going to get my money back.

Kindly find the evidence attached.

In the second line of the statement, I had made the payment through stashfin app.
In the first line EMI was deducted from stashfin side ( auto debit ).

Kindly help me to get this issue resolved.

Thanks & Regards
Bikash Singh