Problem solved
I found the initial contact via WhatsApp ok when we had an issue with our Growatt battery/inverter but once the technician I was talking with wasn’t sure of the issue I got ignored! I opened a new case and had someone much more helpful who told me how to test some components and once we established there was an issue they arranged for a technician to visit our home. The technician, Owen was great and called to arrange the visit and got to the bottom of the issues straight away.