And if, for some reason, even that doesn't work, then go to classic.checkmytrip.com and use your reference in there to check the status of your booking.

Clicking the "e-ticket receipt" tab (if there is one) will show you all the live coupons of any current e-ticket. You may want to check whether you have a coupon for every sector of the trip that you're booked to take. If so, then the chances are that the ticket has been properly issued.