The worst customer service I have ever experienced is with TalkTalk. I left them as I found a much cheaper provider. They sent a bill for a period after I left. When I called them they said I would have to pay or I would get a £10 charge for non payment. I req to speak to a manager who was just as useless. She said there was nothing she could do about it. I said I wasn't happy and she asked if there was anything else she could help me with. She never helped with anything in the first place!!!! Foreign call centres do my head in! Now I have to pay a bill for a service I have not used.