Spam and Ntl is unfortunately a fact of life. Reporting it to ntl will probably result in absolutely nothing.
Ntl's "useful" advice on Spam can be found at
http://www.ntlworld.com/help/aup/dealingwithspam.php for what it's worth.
In simple terms, as is said elsewhere on this forum, many ntl email addys are guessed by the spammers. That's how you get junk even to email addys you have never given to a soul. If you really want to rid yourself of spam, get an spamwasher program, and change your addy to something unguessable.