National Payments Corporation of India [NPCI] — NCPI not refunding my money

Address:

Bandra Mumbai 400050

Sir
I have sold 16 USDT on wazirx P2P but I have not received INR in my bank account. So I contacted wazirx, they told that your order is completed you can contact [protected] this number if you have not got your money. So I contacted that number, they told that you have to send some money and message writing that " refund rs 8111 in my bank account" and I have done so.

When I transfer the money they told that your money is stock and it will be credited in your bank account in an hour .
But I have not received my money.
Next time when I contacted them they told that state bank of india server is not responding so it will be credited in your bank account till evening.
Again I have not got my money .

Now when I am trying to contact them they have switched off their phone.

Sir please do something they have taken my 8111 rupees