Not at home on activation date

I just got an email update from O2 regarding the activation of a new DSL connection.
Unfortunately, I will not be at home on the week of the activation day.

It is still unclear to me if a technician visit is needed, as the email and the order status page seem to have conflicting information.
If a technician visit is indeed necessary, then it needs to be rescheduled.

I found no way to contact O2 (the online chat function does not let me log in). Do you have any suggestions on how to proceed?

Thank you!

PS:
Is there a contact email for O2?
On the contact page I find this (translated from German):


which is false, as I do actually wish to send an email (and "wait for a response to be displayed in my mailbox").


Edit: I rewrote some parts of the message. Somehow google translate tried to translate my original post (in English) from German to English... with horrible results.