Make My Trip — tour cancelled

I had booked a group package through make my trip to thailand. my departure was on 16 july.
i recived a mail on 1st week of july saying that the tour is cancelled due to flight issue.
whn i asked the airline thy told thy dnt hve ny issues as such.
Thy travel agency asked me for more money. whn i told i wont give more thy told me to chnage the dates, n the itenary also. i agreed to that also. but whn i asked them to book thy told the seats are full.
Next day thy gve me the departure for 16 but with different flights, whn i ask wat abt the flight u hve mentioned i ur itenary thy told its fare are higher, n i hve to bear the extra expenses.
Thy were trying tp extract money from me by ny means.
whn i had no option i had to cancel the booking, n spoil mq honeymoon.