Musafir — Fraud Company

Hi,
I made an online booking with musafir with the booking reference as M-3WGC3. This was a return journey from Delhi to Dallas.
I flew with Lufthansa Airlines on 16th Dec and the journey was very comfortable with no hook-ups at Frankfurt Airport.
I was supposed to fly back with Air Canada on 02nd Jan, but to my horror I was refused a boarding pass since I did not have a transit visa for Canada.
I wish to know why was I not notified by your so called agents that a transit visa is required for Canada? And also, while making the booking, there was absolutely no notification whatsoever which hinted that a transit visa is a mandate for all airlines stopping at Canada? I would have never booked otherwise.
Imagine the trauma I had to go through at the check in counter that inspite of me having a VALID ticket, I could not board the flight. And ofcourse, I ended up buying a 2000 USD dollar one way ticket to Delhi.
I wish to escalate the matter to the senior officials in your company that I was never informed that a transit visa will be required to take the flight? Is this how you dupe and cheat your customers?
Musafir should not have showed the ticket options via Canada in the first place, and even if it did- it should have notified me about the visa requirements- which did not happen.
Also, i had to stay at the airport for more than 36 hours to catch my next flight back to India. Who is responsible for the inconvenience caused?
The original ticket was a waste as at the check-in counter I was denied a boarding pass.
I want to file a complaint and find a way in which I can be given a due refund of my ticket.

I also called the customer care, but as usual there are long waiting hours and no one answers the phone.
I have also been allotted a complaint number, but no one has called me in the last ten days ever since i lodged a complaint on their website.
Such a fraud company!