Cancel after notice issued

A registered composite scheme dealer turnover below 40 lacs limit.a person order for cancellation of registration Form Gst REG-19 received Dt.25/07/2019.if cancel of gst number after Form Gst DRC-01A sec 73(5),74(5) see rule 142(1A) notice received Dt.21/01/2020 from gst office.
tax period:2017-2018 to 2019-2020
turnover:24920/-
tax,interest,and penality:2990+538+2990=6518/- show in notice.
doubt:
cancel of gst number after notice show in amount tax paid compulsory and producure of tax payment.