REGARDINGSERVICE TAX

hello! My client providing taxable service.

F.Y.                 VALUE OF SERVICE 

2007-08               4,00,000

2008-09               5,00,000.

2009-10               11,00,000

           Since in the F.Y.2009-10 his total taxable service goes beyond 10,00,000 we have registered and took service tax no. in f.y.2009-10 itself and accordingly paid the service tax to Gvt.(Excess S.T. Paid).

             However in the F.Y.2010-11 there is no chance that his total taxable service value go beyond 10,00,000 limit ,

CAN I ASK FOR REFUND OF S.T.PAID IN EXCESS FROM GOVT.?

SHOULD I CANCEL MY SERVICE TAX REGISTRATION NUMBER.?

Pl. advice me