Charities calling my business!!!

Hey i am all about finding a cure of things...i was in charge of the march of dimes fund raiseing at one time..what does upset me..when charities call me here at work..and lie to try to get me into donating money or something...... Tell me who you are up front and what you would like for me to do or donate..and then if i say No ...leave it alone...Are we not told when we are younger that No means No..not badger til they say yes...... i give to the charities i feel a great connection too....and i try to give back to the community in my neighborhood..but if i give to everyone i will deplete all my assests and then asking for charity myself....Please Please stop theese charity tatics...they dont work with me.....you know who you are!!!!!!!