Sorry although I signed up for it a few years back I no longer have the nationl number.
You know they never do stop trying, if they can't sell stuff they call saying it's a survey and end up trying to sell you stuff. Whenever DH answers any of these calls he just hangs up, he says since they are rude and distrubing him with unwanted phone calls he'll be rude back and hang up. Do they care? I don't think so.