...on the first ₹ 20,000 spent and 10 RPs per 150 spent for spends above ₹20,000.
The points you have earned is as follows:
First 20K: 20,000/150*3 = 400
Remaining 27K (base): 27,000/150*3 = 540
Total Base RP = 940 (seems in line with what you got)
Now for the bonus RP:
For 27K: 27,000/150*7 =...