I had deposited less tax in GST 3B in 2017-18 for which we got notice from the department.

I had deposited less tax in GST 3B in January 2017-18 for which we got notice from the department. There was a mismatch of Rupees 1 lakh in GSTR 1 and GST 3b for which we got notice. And interest of 1 Lakh is 2 lakh. Total amount is 3 Lakh. Please suggest me how can reply this notice. Can the interest be waived.

I had deposited less tax in GST 3B in January 2017-18 for which we got notice from the department. There was a mismatch of Rupees 1 lakh in GSTR 1 and GST 3b for which we got notice. And interest of 1 Lakh is 2 lakh. Total amount is 3 Lakh. Please suggest me how can reply this notice. Can the interest be waived.