Interest on liability

we claim 56 lacs ITC, this amount shown in my gstr-2b, but when I file
my gstr-3b, I don't shown sales & liability in Feb 2018, I shown this amount in Feb 2019. my credit ledger is shown less than rs. 56 lacs, I utilised rs. 2.50 lacs out of above 56 lacs rs, then gst officer charged interest on whole amount rs. 56 lacs. pls suggest me, action of gst officer is valid or not.