Transporter Gst Cancellation

Dear All,

My One Of Transporter Client Take Gst No. in the month of July 2017 .There After Come Notifications Regarding Exemption for Transporter.

Now Question Is

●We Are Filling Nil Return From July to till month Both GSTR 3B & GSTR 1
(Am I Right)

● Now I Want To Cancel Gst Registration Any one tell me process and Reason Which I Write and Select at the time of Cancelation.