Qatar Airways Cancelled my booking.

I booked Qatar flight from Johannesburg to Hyderabad. I got email from Qatar airways saying that the flight booking is cancelled due to operational reasons. If they cancel the booking it's their responsibility to give me alternative booking, but they didn't. This is a big **** of cancelling the booking and increasing the ticket prices. I am so disappointed with Qatar airways, as I want to visit India to see my Mom who is very sick. And now when checked the ticket prices are tripled. So disappointing. I would not recommend Qatar in future.