I also send them emails individually up to 3 times and if still they don't react, you can leave them. why waste time pushing if it not interested, and what SFI rules of success tell you? "SOME WILL, SOME WON'T SO WHAT? SOMEONE'S WAITING, NEXT". You see it's gonna be useless, even how much you explain to them how lucky they are now at SFI that only can give you the best opportunity. Try to look for the right person to sign up and join the business program.