Perhaps you should stop taking their calls OR go out on the dates and TANK them. When people refuse to believe what you say, sometimes you have to show them that you mean business. Maybe go on a few of these dates and tell the suitor that you really aren't interested but your friends made you do it.
If that word gets back to them enough, they'll leave you alone. By the way, what kind of friends don't listen to you at all? You tell them that you are good and they still refuse to accept it? Are you lying to me about being happy or are they just the least receptive people on the planet. Maybe you say that you're happy but you look like you miss love and all that comes with it or something.
Or maybe they just really don't care and need you to have somebody because they do. So, it may sound extreme but it could be your only recourse - tank some of the dates. But please let the guys know upfront that you're not taking them serious so they know they don't have to pay for your half of the bill.
Bazinga!
BAZINGA! (LOVE, LOVE, LOVE TBBT reference!)
Try telling your friends that you're sorry their single days were so sad and lonely, but that you're really doing great on your own.