Bashing # several times quickly also works on a lot of systems. I always give it a go first time around - when it works, the voice bot typically says 'I didn't understand that, I will connect you with a.. [human]'.
Failing that I also resort to answering in one word answers. Bots can't handle any sort of ambiguity. Even when they manage to solve the language-parsing problem, people will still just bark one word answers at anything that looks or sounds remotely non-human[1] because that's how the early AI's trained us. The future-concept of people chatting away to robots is incredibly unlikely because to do that you need a level of empathy for the person/object you are talking to. We've clearly shown so far that we just don't have it for bots.
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[1] Like the 19th century British Explorer shouting English at the natives.
