after a satisfactory installation I had to request an invoice and an electrical installation certificate as this was not provided. I have over the period of a month called 10 times to ask for these documents and am still waiting for the electrical installation certificate (which I need to claim an EST grant). On these calls, I have waited 5-30 minutes on hold and some calls have been cut off mid-call. I have raised "cases" twice. On no occasion has anyone called me back or emailed me explaining the delay in providing a certificate despite promising to do so. The three teams involved (homecharge, customer service, and compliance) seem to pass the request amongst themselves but never action it.