How to show in ST-3,Notice Recd

For Manpower Services,

We received notice for 2015-16.So, asking queries.

Government thru Notification 07/2015 dated 1^st April 2015 made 100% RCM on service Receiver.

In that case its better to cancel service tax registration of service Provider or whether he can file NIL Return or needs to fill in which field service provided amount.

Thanks