Input claim disallowed

Sanjay Prasad (Assistant Manager Accounts )   (66 Points)

06 February 2022  
Dear Sir,
One of my debtor is doing business under 2 gst no but same entity name. I have filed gst return for may'19 under his old gst no, but revised the same in new gst no in march'21. Now he is telling that govt is not allowing input credit under new gst no.

Please some body can guide me what can be done.

Thanks and Regards,
Sanjay Prasad