Am trying to book LHR to MEL, setting off on 18th October. Flying in Y.

I start the multiple destinations process and whichever combination of LHR/DXB and DXB/MEL I choose I get this

Sorry, seat availability has changed. If you require assistance with completing a booking, please contact your local Emirates office.

As it is unlikely that all seats are booked at this stage I am guessing this is a website issue...these do seem to occur frequently when booking the LHR to OZ routes.

Does anyone know a quick way of reporting this which doesn't feature premium rate phone calls?

Thank you.