When I saw this indicator board on the Tube some months ago, I immediately assumed it was faulty and sure enough (as you can see) a train arrived in three minutes. But, in those three minutes, it was amazing how many others passengers (not tourist) surprisingly took it at face value and left to make other journey arrangements.
People believe what they believe. They do so based on their world experience, and yet the majority of marketers focus on positive proclamations about their product or service in the hope that this will change their mind. But to supplant an existing worldview, you need to do more than provide an alternative, you need to undermine their status quo.
People are arguably more intrigued by persuasive arguments that are at odds with their beliefs (especially about trivial stuff like brands). So don't make nebulous claims, debunk received wisdom. Refute people's prejudices. You may be selling products or services, but bundled therein is your expertise and it's that which people really buy.