Please stop calling me. Just because I can't speak Spanish well does not mean they should just hang up on me. Furthermore if I clearly can't speak the language why do they keep me on the recall list?
Probably because there's an answer of some kind at your number. That goes over better for them than ones that only ring. Those are the kind of numbers that find their way onto pests no call lists since they become a waste of time. Other than that, it'd be to trick you out of money, personal or financial information, or take over your computer. Hang ups without saying anything are usually fishing for working numbers.