How do I get the screen back during a call?

Current member on a 'break '. (M-4, account disabled)
Waiting to be put through to a real person in an automated call to a government dept, on speaker, 10 minutes plus, phone laid down.

I try to get the screen back up. You can't! I tried twice. Lost 10 minutes and 15 minutes of holding.

I have really not used my recent Moto G much for calls. Samsungs only previously.
The screen times out while waiting, fine, I touch the screen, it's locked, fine. I touch the power key like on a Samsung (no Home key) the call is ended. I try again, wait 15 minutes, try volume buttons, no effect.
I try the proximity sensor by holding it close to my ear.
I touch the power button quickly, still ends the call.

Basic requirement. How do I do it on a Moto G?
Sorry I can't reply with a disabled account. Many thanks.

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