Pease answer

Its not about how much you have utilised!

But if you have valid tax invoice and if all the condition of section 16 is satisfying then the differential ITC between GSTR 2A and 3B can be availed in GSTR 9/9C.

I would suggest you to get the confirmation of the party from whom you have purchased that why its not reflecting in GSTR 2A. Just being on a safer side.

May be due to any mistake in RCM