Travelport ranks on top among the worst customer service experiences that I have ever had. Their phone numbers are mostly unreachable, they are unresponsive on email. If after persistent effort, you do get through on phone, each representative will just say - hello, yes?
Once you tell them what you want, they will forward your call to the next one, who will ask you to repeat everything you just told the previous person and this person will forward you to the next one. You have to go through at least 3 people to get to the right person. The representatives are very rude and talk as if they are doing you a favour by giving you information. Needless to say that the information is neither complete nor accurate.
As for their gift vouchers, they are entirely useless. Not only is the redemption process extremely painful, they do not have availability as per any of your requirements.I would strongly discourage anyone from trying to take their services.