Cleartrip — No refund on my rescheduled ticket

Address:	793009
Website:	Cleartrip

I have booked a ticket earlier for 7th august 2017 but as plans changed i had opted for rescheduling the flight. As stated by clear trip only the difference would be charged, but this was not done the ticket earlier was ₹3001, and after rescheduling it came to ₹3510. You have charged me ₹6511. So can you send me the refund required??... Since i had trusted cleartrip that was why i booked n rescheduled the ticket but it sells to pay no attention so is there any other way i can get my money back. I am still a student n i need money so kindly do the required.