This morning I got a call from this number and found a voicemail as well, spoken of course by a shitty text-to-speech program. I figured what the hell and decided to call them back, and since then I’ve been screwing with them all evening.
They are most likely a call center somewhere in India. Very strong accents. Generic names like 'Kevin Smith' and 'Frank Brown' are to be expected. There's also some female who's name I couldn't recall.
Have fun!