I have two TalkTalk accounts coming into the house in Oxfordshire. Have had for years. I know: silly to have two lines by the same supplier (uh-huk-uh-huk). However, the only problem we have had is with one of the accounts is that my business caller ID has never worked. I checked in my online account meaning to make sure that it was turned on and it said that it was.
Long and short of it, saw this article, decided to give TT a hard time about it at last. Got straight through - I mean straight through after the menus. Turns out it was turned off all the time. Bish bash bosh turned it on. Now I don't have anything to gripe about which my missus would disagree with.