Contact
How many sites, what they run on, and when you would want to move. That is enough to answer properly.
How to reach us
Telephone
By email first, which reaches us faster than a phone would
Hours
Weekdays, 9am to 6pm, with an engineer on call outside those hours
Escalation
If nothing has come back within an hour, say so in a second message and it reaches the engineer on call
Everything is working normally.