Hello?

Phone: Ring ring ring!
Me: Hello?
Person calling me: [something in spanish]
Me: You have the wrong number.
Person calling me: [something else in spanish]
Me: This is the wrong number.
Person calling me: [even more stuff in spanish]
Me: [Click.]

Question: Even if you don't speak enough english to understand the words "wrong number", isn't just the fact that I'm speaking english all the information you need to know that you've got the wrong number?