Uber India — offer of 50% off did not consider in charges

Address:

Mumbai City, Maharashtra, 400053

I am a regular user o[censored]ber services as rider.
I have received following message on 25.9.2017 offering 50% off on 10 rides till 2.10.2017. Reproduce as it is:
Uber: you have got 50% off your next 10 rides in mumbai on ubergo and uberx until[protected]. Apply promo code ridee1wagr to redeem.
From 25th september i have taken following rides on ubergo:
1. 29th sept, 2.54 pm, paid inr 198.69
2. 27th sept, 7.44pm, paid inr 227.55
3. 27th sept, 6.23pm, paid inr 279.35
4. 27th sept, 11.54 am, paid inr 233.65
5. 26th sept, 11am paid inr 269.28
6. 26th sept, 7.22pm paid inr 291.38
Total of inr1499.9 and i should have received 50% off= inr749.95
Please arrange to pay.
Further when you make such offers, please advice where to apply promo code as there is no such provision while booking uber go taxi