well done littleforgetmenot, i do not think they will forget this for a long time to come!!! the saying of treat others how you would like to be treated comes to mind, the reason you were not getting through before is you were not treating them how they expect to be treated, by lowering to their level they are more likely to take heed of what you said!children understand things at a lower(simpler) level than adults, these two do not seem to have mastered the friendship part of growing up so still see it from a lower level!
you handled the situation how most people would after being messed around for so long, only most would have done it months or years ago!!!! i admire your patience!

now is time to move on and find friends who value you for what you are rather than mess with you because of a dx. i would leave them well alone from now on, if they try to contact you do not respond, leave it as it is, you did what you had to do, you will never change them, don't waste your time trying anymore, life is too short. enjoy life enjoy new friends xxxxx