Smart meter IHD stopped working about 6 weeks after installation. I accepted I couldn’t expect much action during lockdown but since then..... I have lost count of the emails and phone calls made. I am sent a list of questions which I answer and am told response within 5 days which doesn’t happen. Have to start again with phone call to someone who can’t deal with anything so pass it on and tell me response 24-48 hours. Then it’s back to list if questions, my answers and 5 day wait that doesn’t resolve anything. I think the only solution is to change supplier