Answer for A Company giving services form April to March of 2015-16 and charging service fee of Rs. 50,000/- pm, but on revision of agreement they charge arrear of Rs. 5,50,000/- pm from Apr'15 to Mar'16 in the month of Mar'16. What is the provision of Service tax provision says on this typr of invoiceing?

Relevant fact – Arrears has been charged on MARCH and Significant amount has been revised – from 50000 pm to 550000 pm.
 
It is most likely that tax department will see this as tax postponement and might try to recover the interest amount.
 
Following points can be kept before the tax department:
Date of payment of monthly charges during the year.
Allowed credit period in agreement.
A Valid reason as to why agreement was revised and such a high value nearly 10 times the original value has been kept as new fee.
In such case it is suggested to have strong paper work – Agreement specially.