This unkonwn caller keep calling me several times, I tried to call back to see who is on the other end.  But when I called and asked why they keep calling me, they answered only in Spanish.  I don't understand a word, for I don't speak Spanish.  If they then stop calling, I would be ok. But the problem is I totally don't understand why on the earth they still keep calling me after knowing I don't speak Spanish ( because I called in English ) ?  I don't know if it's just prank or serious potential for info stealing or fraudulant behavior.