Normally, when such services are given @ ₹1, you see a duplicate of the channel in the service section. One with the actual price of it and the other one, which is provided for discount @ ₹1.
Since, these offers are offered on Wednesdays and Saturdays, users should be able to activate it before 11.59pm on the above said days from the app. If it's not available, then on the same day, you can contact the CC and activate from their side.