Company X is Composition Dealer,but he wrongly raises invoice as a regular dealer and also charges CGST/SSGST/IGST in his invoice.The buyer say Y is unaware that X is a compostion dealer and receives the purchase invoice -showing CGST/SGST/IGST amount and therefore claims it in his monthly return .Now what shall Y do on becoming aware that X is not a regular dealer but Composite dealer? Also what sort of Penalty and Interest may the Officer ask for wrongly claimng the input CGST/SGST/IGST?