GST IN CREDIT NOTE

Samrat Karar (110 Points)

26 March 2022  
I purchased a taxable product on 05/08/2021 and take input in gst. Now I have returned some of this product due to expiry of product and some for damage on 26/03/2022. Seller issue me credit note without mentioning gst amount. They are explaining that after 6 months output tax can not be reversed. without their taxable credit note I can not reverse my input gst.
Is it right procedures?

Can anyone guide me...?