
Don't stop complaining
Don't stop the complaints. Write to your MP and MEP (Member of European Parliament):
http://www.writetothem.com/
Complain to the ICO using this form:
https://www.ico.gov.uk/Global/contact_us.aspx
Complain to BT using this form:
http://bt.custhelp.com/cgi-bin/bt.cfg/php/enduser/cci/bt_afdpage.php?cat_lvl1=770&p_cv=1.770&p_cats=770
Complain to Ofcom about BT's poor customer service, snooping, and trying to bind you to an 18-month contract when it has been materially changed:
http://www.ofcom.org.uk/complain/internet/
Remember, you can cancel your contract if the contract is a material change and is detrimental to you. See: http://beta.bt.com/bta/forums/thread.jspa?threadID=7116&tstart=0