I do paid my GST 3B more in value without taking IGST input tax of Rs:9,372/-. I filed my GST 3B for september 2017. Later at the time of reconcillation, i found that i missed this Input. So inthis case how can i revise my GST 3B for September 2017. I communicated the same to my vendor for chnaging the bill to next month. But he said that he had paid his september GST 3B. Now he cant change his bills. So in this case how to go with my unused Input GST amount of Rs:9,372/-. Please guide me.