New amendment of gst of construction

I Just want to know Hamare bhi builder ne gst managa h in case agar usko humne pay nhi kiya to vo humse penalty manag raha h till 20 to agar humne pay nhi kiya to me rate of interest 5% ya 1% lagega jabki abhi 8% lag raha to iska my solution h ? Mtlb hum ky Kare abhi pay kare ya nhi q ki agar pay nhi kiya to penalty jadase Jada 2000 lageaga ek din ka to 20 ke baad pay kar dege lakin rate of interest to kam lageaga Na to ky kare asa koi rule h ki 20 ke baad bhi Jada pay karna ya nhiIs situation me ky karna chayie