Uber India — I am not getting the 50%

Address: 711101

I have got a message announcing a 50% off on 10 rides till 4th. September. But while trying to book no discount option is displayed so that i can avail the discount. If i am not entitled to get any discount then why such message is sent to me. Please helpme. At least tell me how to book a cab without the discount option being displayed on the screen.