ACT Fibernet — Billing issue

Address:

Hyderabad,Attapur

As i have not been informed of their increase of plan's amount before the bill generated, the adjustment of the amount for non-availability of their service, must be done with rs 425 and not with the new amount (Rs450).
Act has increased the plan's amount from rs 425 to rs 450 without informing me (Customer).

I was not having internet facility for 12 days/ because of you un-availability of the internet service.
Also, the calculation of the adjustment in the bill is not correct.
So i request you to please share the calculation sheet.
Unless and until these things are not clarified or settled up, i cannot pay the bill.

Following things i need to get:
1. Calculation of adjusted amount
2 the adjustment amount should be adjusted with the base amount i. E rs425.
Here is the calculation:
425/30=14.1666
14.1666 * 12 days = 170
425 - 170 = 255
Tax 9% + 9%) should be calculated on 255 which would be : 45.9
Total payable amount should be - 255 + 45.9 = rs 300.9
So my payable amount is rs 300.9 instead of rs 402.