The truth is both sides have to consider each other. Yes, it is true organizations need money and must fundraise, however, they must do it with seichel. If they contract out to a call center, they should be sure they don’t engage a firm that uses tactics that browbeat and try to shame and humiliate people into giving a donation (you don’t want to help feed poor starving orphans?!!?) or otherwise use harrasment or annoying tactics. Those solicited on the other hand must keep in mind that the caller is trying to reach you when you might be home and available to speak with them. When do you expect them to call, when you are at work? Would you give them your cell phone or work phone and ask them to call you there? Remember, you answered the phone, if it is a bad time, don’t answer it, let it go to voicemail, tell your kids who answer the phone, you are not available to come to the phone, don’t be upset with the caller because you interrupted what you were doing and answered the phone!once on the phone, there is no reason to treat the caller like a disease carrying rat.
So, the question is not, how to stop people from soliciting tzedaka, rather, how to deal with those who do so in a manner not befiting a respectable organization. When such a call is received, one is not obligated to respond positively to the solicitation, but one must respond like a mentch.