Olx — fraudulent transaction of money

I gave an on OLX. The buyer asked for registered Paytm number for fund transfer. I got the transfer link. On accepting the payment, the money got debited from my account instead of getting credited.
Already reported the Bank, Paytm & OLX. But the matter is still not taken up by anyone.
The fraud is occuring the most in olx. Submitted all the details on its helpline desk. Awaiting for response from the OLX team to check this issue from their end, since from the past records its being observed that most of the online frauds occurring from OLX.