Tata Sky — reg payment due date

Address:

Chennai, Tamil Nadu

sir my subscriber id[protected] my due date is 3/1/2015, today i paid the same, my next due date should be 3/2/2/2015 but iam getting msg 2/2/2015, last month also my due date was 4/12/2014 after payment i got msg dnext due date is3/1/2015, why u every month reducing one day? S Narasimhan