Tata Sky — Paid for one month but showing only 17 days (ID:[protected])

Address:

Visakhapatnam, Andhra Pradesh

I have booked HD new connection with one month subscription on 20th may'15.Same day Dish was fixed and connection given.On 21 may I got a message to my mobile Current a/c bal Rs:117.64.But I have booked Rs:340 monthly subscription.Then where is my one month subscription.So pls provide one month subscription from the date of my purchase.