Halevai such “do not call lists” would work. Any legislation about phone solicitation specifically excludes non-profit organizations. I actually investigated the matter, since my office work is disturbed by these interruptions. Worse is that the caller introduces an organization that is completely strange to me, and tells me that I was “so generous to give $18 dollars last year”, begging to increase it for this year. My response is that this is a total lie, since I never heard of the organization, never pledge over the phone, and will not do so now. They then let their chutzpah shine, asking for my credit card. My answer is that I do not use credit cards, and would not share them with a stranger anyway. I never give them, despite their persistence. My tzedokoh dollars go elsewhere.
The persistence at raising funds is unfortunately not correlated in any way with the legitimacy of a true tzedokoh. What a shame that Yidden have stooped so low. I would prefer to cherish the beautiful mitzvah of tzedokoh.