I won't name the organization but after donating money I started to get constant mailings requesting more money with these form letters that seemed to be written by some of the folks in here who've never learned to write a cogent sentence and somewhere picked up the idiotic habit of underlining certain words, phrases, sentences, or, for even more emphasis I assume, use ALL CAPS instead.
I sent several of them back, sans an additional donation, but politely asking to remove me from their mailing list or they'd never see another nickel from me. That was a waste of time as solicitations continued.
Then one day I received another request from them, via FedEx this time, that included a handy prepaid FedEx return envelope so my expected donation would be in their hands lickety-split. That pissed me off a bit so I wrote a snarky reply letter that stared out something like: This is my form letter in response to the FORM LETTER I just received from you...and went on to point out my several previous requests to stop bugging me, with several more underlines and CAPS tossed in just so they might realize how stupid it looks to constantly do so in correspondence. I also pointed out what a waste of their precious money it was to not only overnight the request to me but also to get my reply letter overnighted back to them without an enclosed donation.
And that, finally, did the trick. Never received another request and never donated any more money.