11 March 2015
Please refer D.O.F. No. 334/5/2015-TRU Dated 28.02.2015 from link given below:
http://www.cbec.gov.in/ub1516/do-ltr-jstru2.pdf
In Point No. 3.3 it is clearly mentioned that "The new Service Tax rate shall come into effect from a date to be notified by the Central Government after the enactment of the Finance Bill, 2015."
So you need to wait. Till new rates are notified the existing rate of 12.36% will continue.