Service tax amendment

Sir as we want to make amendments in ST 2 certificate for auditor can u tell me what and all documents we should attach while making changes for the following

1.Name
2.Address
3.Service Tax Registration No - there is a alphabetical mistake in Service Tax Registration No..

I also Want to know that whether service tax should be paid on Bill Basis or Receipt Basis from April 2011 if any notification is there means attach it kindly

Please help me its really very urgent