What do you do when you realize you are addressing the wrong problem?

…Too often, the stance of the designer is oriented almost solely towards problem-solving. Too often, that’s what they’re trained for. The issue here is something rarely considered at school: what do you do when you realize you are addressing the wrong problem, your bounded remit having been the outcome of the wrong question in the first place? This happens frequently in design work in practice, and yet stuck at the wrong end of the value-chain, simply problem solving, it is difficult to interrogate or alter the original question. you simply have to solve within the brief you’ve been set; you can’t challenge its premise.
Dan Hill, Dark Matter and Trojan Horses, a Strategic Design Vocabulary http://www.strelka.com/en/press/books/dark-matter-and-trojan-horses-a-strategic-design-vocabulary