Service tax or gst?

Ravi Darisi (Retd. Genl. Mgr. RIL Navi Mumbai)   (39 Points)

12 July 2017  
I paid Ins. premium alongwith Service Tax thereon in June, 2017 whereas it was actually due in July, 2017. Now the Ins. Co., is asking me to pay the difference, saying since the premium became due only in July, GST is applicable. Please guide.