I called their Home Max number again (0844 873 8586, option 2 then option 5) at 7:12 and was got the "due to unforeseen circumstances we are unable to answer your call" message again..

Time of checking: 07:14
Attainable download rate (kbps): 352
Downstream Rate (kbps): 288
Upstream Rate (kbps): 128
Home phone line: Offline
VOIP line: Online

I think I will try again at 08:00