They offer very low rates, but as soon as you have booked the calls or emails start asking you to pay an additional 50% to 150% of the ticket's price. In my case, it was more than 750$CAD. When you refuse, no refund, but just cancellation fees. The only choice you have left is to quickly contact your credit card provider to explain the fraud and get your money back. Please stay away!
PS: NEVER PAY WITH AMERICAN EXPRESS (They never get your money back and leave you responsible for pre-approvals, even if you close your account).