PayUMoney — Discount on ticket/discount not given on booking

Address:	500072
Website:	payUMoney

I booked m ticket pnr no-TS-RB24627000JOO/67239/SDT-02 today at 6-40 pm for my travel from Hyd to Machilipatnam on 23rd Jan...while booking I was offered a discount of Rs75/ on Rs600 if it is done through payUMoney ...my offer code was given as RBJAN20 and I made payment thru my debit card with payment Id[protected] expecting I would be charged only Rs575/ for the ticket...as I finished payment I was puzzled to note it was rs 600/ ..hence I request you to check into the matter and arrange to refund the excess money charged to the corresponding account...thanking you
regards,
kumar babu