Here, here.
I'm in Taiwan, and on a trip back to Blighty in May got my mum connected to tiscali broadband.
Fine until you want to try and update payment details. Can't seem to get to the page from an outside ISP, just comes up as a server error.
As others mention c*** customer service, "we'll get back to you within 7 days" auto email replies, and when they do they don't answer your questions , just send out a standard "this'll probably fix it" message.
Now that Bigwings has given the switchboard number me thinks an irate call on Monday will help let off some steam.