WiFi, Broadband and Talk not working

[NigeW55]

I've had no wifi, broadband or talk connection since early afternoon. The router shows three green lights - phone light was initially Amber but has now gone off. Tried service checker in the App which suggests there is no fault. WiFi on phone shows as connected without broadband. Tried resetting and disconnecting power without success. Any ideas? What's the phone number to speak to a human?!!