Recording about making tons of money, Blah Blah. the only way to stop them is to block them as they will keep calling. I use viatalk for my landline and block anyone. flatRateCalling.net
On my cell just downloaded Xtreme call blocker, works great.
Called repeatedly in the AM, I called back to see who it was - got recorded message re: some "opportunity". Hung up about 20-30 secs in. Really hope this isn't one of those ones that charges you without telling you.