I never answer these unknown numbers, but what the heck, I did today. Nice voice on the phone thanking me for my past donations to MS Society (which is true), and asking for a donation this year.
I asked him who he worked for, and he answered 'Heritage'.
Great cause, timely phone call, and I NEVER donate through professional fund raisers, so, shame on the MS Society for engaging a 3rd party to contact me, and for obviously selling me name.