How not to make a prospecting call

I was working from home when the phone rang. No sooner had I finished getting the greeting out of my mouth than the distant monologue began.

I somehow worked out that the woman on the other end of the line was calling from a charity. At the 30-second mark I interrupted her and asked her what the purpose of her call was, but she did not respond and just kept going. Sound familiar?

At the .....