Not pay service tax

Since st is indirect tax and u r not collecting from customer that deems to be your fault only remedy is that while calculating St totalbampunt will vlbe consider as you have collected st and that includes st Ex :- bill value 100 St 12.36 Total :- 112.36 But as per query u have charged only 100 instead of 112.36 now it will be calculated as =100100112.26 Interest penalty is mandatory And there are many other penalty which u can refer Str like return,late payment,short payment and so on