They're still at it
I was contacted 4 times in a day. They called me yesterday, and I tried to ascertain what data they had on me. They could only give me name and address. They couldn't confirm my account number, or any other details. They couldn't even tell if I was a customer of TT or TT Business. This suggests that they are working off an old data set, one with few details (I was a TT customer ages ago, but moved to TT Business to get a fixed IP).
At one point, they told me all ISP helplines go to the same number. They finally hung up when I told them I had called the police to trace their number (which I didn't - I tried that before, and the police said they couldn't help until a crime had been committed)