Wrongly adopted composition & issued tax invoice

maheep barnwal (1 Points)

22 September 2017  

I have a unique query, I had taken registration in gst under regular scheme but the advocate made in composition scheme. Now i have issued tax invoices carrying a amount of 80-90Lakh. 
My query is how would i change to regular scheme?
Whether I'II be able to take ITC after adopting regular and how?
What penalty would be imposed for not filing returns of july august sept?

explain in detail please