The only point where he could be "scamming" is if the paytm payment someone receives is charged back or is for some sort of illegal shit where the person entering such a deal could be held liable.
That's the main point, in India there is 1000's of paytm scam cases coming regularly. It's highly risky to take paytm from unknown, we don't know from where and after what offering he is getting paytm.
Show me 1 paytm scam where the money was charged back after payment. In all my years of trading I have never seen that. Sorry.
If you did not got charged back doesn't matter it's not happening.