To be honest, it'd be a remarkably convoluted way of self-promotion. I'm a comic and writer, I don't expect a letter to NTL to generate any more work in either of those areas.
I have been contacted with NTL but this response was more to do with them getting the phonecalls to stop, which I've already done. I'm much more concerned with the issues of data protection and harassment. I've asked NTL to stop using MGT or any other company with an auto-dialler. If you think about it, I was very lucky to find out where these calls were coming from, how many more people are being similarily hassled? Also, my details were given to a third party company without my consent and they have a lot of other clients.