Paying for their appalling service
When I was trying to help my sister sort out her problems with TalkTalk following the death of her husband (Guardian story here: http://lifeandhealth.guardian.co.uk/consumer/story/0,,2179089,00.html ) I tried email Dunstone personally, but the emails bounced back.
Their abysmal customer service is the reason I recommend that no-one goes near TalkTalk with a barge pole.
Danny