I've just been on to CS about getting a new cable modem to replace my Surfboard 3100. First phone call I was given the phone number for the Xbox Live(?) support (0845 650 0101) aftere being put on hold. I phoned again and the second the agent (Chris) told me (after being on hold again) that I should be getting the full speeds and transferred me to the cable modem fault support people, well, transferred and currently waiting 10+ minutes in the queue. Now discovered that they've transferred me to the faults who don't do broadband support apparently.
At this rate I might even consider paying the £50.