I am a service provider, i had paid advance service tax. It can not be adjusted under existing law. can i claim it as ITC. Actually i paid service tax Rs.3,00,000 but i had adjusted service tax under last Q1 2017-18 return is 252410. how can i get the balance amount Rs.47,590 wheather can i go for refund in service tax or is there any option to claim ITC in GST. kindly give me reply.