False advertising on chenageable bookings!

When you pay a premium for a changeable ticket, you expect to be able to change.

But, when I actually needed to change my departure date, I was unable to do so.

Despite the confident claims on the website, and a specific link to 'Change my flight', all I could ever do was view my booking.

The same thing happens on the app.

And don't even consider phoning the call centre. The line goes unanswered. My call might be important to you, but far more important to me is knowing how long I will need to wait to speak to someone - minutes? hours? days?