Service tax registration clouser now

Dear Sir,

One of the company closed the business operations in 1st March-2015.

The company Business operations is Software Exports.

We already inform to Department about clouser of Business oprations in the month of June-2015.

We filied the Nil returns upto date.

We get the service tax refund up to Feb-2015.

Now the GST ACT commence from 1st July-2017..

Please advice how to clouser the service tax registation Now.

Regards

Srinivas

9849334521