It appears that, apart from speaking to the AI system called Rachael over the phone, I am unable to reach anyone from the technical team. The inverter is showing a flashing red light and the system is offline, although I can still see the Wi‑Fi portal on my phone (so I assume the dongle is working). The AI informed me that someone would call within 24 hours, but it has now been more than a week. No one is responding to emails either. How can I get this resolved?
The short answer is you can't.... at least not quickly. GivEnergy support has been like this for well over a year, and there are lots of threads about it.
Email support usually responds eventually, it seems to be about 1-2 months for most people.
If you use Facebook a few people seem to have had success with staff in GivEnergy Facebook groups, but I don't so I can't point you to them.
If you post some details about your equipment then other members here may be able to offer advice that helps you diagnose or fix it before Support respond.
In addition to that, have there been any changes to your home internet or WiFi recently?