GST - ( REMEDY TO ADJUST LATE PAID TAX WITH INTEREST ) - Goods and Services Tax - GST

Dear Experts kindly guide for pharma mfg client for expansion bldg contractor during fy 20-21 raised bill say appx 50 lakhs and gst @18% at rs 9 lakhs was also added in his bill which were accounted and itc for 9 lakhs claimed however due to covid at contractor end due to hospitalisation of staff and owners contractor failed to file same in gst return nor paid this gst billed in 21-22, on pointing out same he paid in dec 22 tax of 9 lakhs with 2 lakhs interest however now gst officer informed last date to-avail credit was sep 22 so no itc credit for co is possible and nor contractor get this back pl suggest way out to use this tax payment made and avail credit also pl note ,while paying in dec 22 vendor mention 21-22 invoice dates as 22-23 dates so then he can make payment in 22-23 for 21-22 bills made possible