One address does everything.
Write to the address below. That's it.
There is no public phone line. Email comes first. If a call is the better way to settle something, an installer conversation for example, we book a time that suits us both. That way the call is expected, not an interruption. Email stays the front door, which is how every question gets a real answer instead of a placeholder one.
If the question is about a privacy or data-protection right (a copy of your data, a correction, a deletion), the same address handles those too. The full picture lives at privacy, and a plain-English version of how installer matching works lives at trust and privacy.
If a week passes with no reply, send the email again. Inboxes lose things, especially small ones. A second nudge is welcome.