Note to evil, evil telemarketer scum. The phrase "courtesy call" will cause me to hang up immediately. It's not a courtesy to tell me about your seminar. It's just intrusive and irritating. Also, if you have to advertise your investment opportunity via telemarketing I'm going to assume that's because it's of sufficiently low quality that no one but gullible fools who buy stuff advertised via telemarketing would ever invest in it.
Time to sign up for the Do Not Call register.