Seems to be a known fact that you must cancel Lovefilm thru the phone line. There seems to be a trick.. try to cancel online *after* 10-11pm (GMT +00:00). Please check if the webpage looks different then!
And if you cant cancel it (because they dont pick up the phone or have some excuses), just cancel your credit card. That's the safest method anyway
Quite a few people (at the end of their subscription month) experience problems with lovefilm phone customer service!!
ref:
http://www.eurogamer.net/forum_threa...read_id=141686
Just let us know how the phone call went for you!