You dont get it, there IS rupay option in the form but they ticked MasterCard somehow. Also changing the form dont work because it's just a computer print out the request is already in the system now. He will have to hotlist it after receiving (which will cost money, 118 or 177) and then place request for RuPay.
This is the reason I specifically mention rupay select around 5 times because mastercard (or Visa I think) comes on top in dropdown and unless u tell them, they select the first option