Unable to select move date when using my PAC code

Can someone please help me with the following issue?

When I login to the id mobile app and select ‘Switch to ID’, enter my number to move, my PAC code (Three), and click continue I get prompted to enter a switch date. My issue is all the dates are greyed out and I’m unable to select any. I’ve used that pathetic chatbot and followed all the following instructions.

1. Tried in web browser and mobile app.
2. Cleared all cache settings.
3. Tried using multiple browsers (Safari, Bing, Google etc.)
4. Restarted all devices and retired.
5. Waited a couple of days before trying again.

After trying all this (and a few other things), I’m still unable to select a switch day from the calendar menu. Please! Please! Please! can anyone help resolve this issue as I can see no way to contact id mobile. 

Or were the doom merchants correct in warning me that id mobile are a terrible company to deal with.