It was going so well, so what happened? Many copywriters get off to a wonderful start: The headline is compelling, the body copy is benefit-filled, but then comes the call-to-action and the whole thing falls apart. Why? It could be a dozen different reasons, but one of the most common I've seen is that the call-to-action doesn't fit the target audience.
Call-to-action statements (those final words that inspire your customers to take an action - usually to make a purchase) are not universal. Just like your headline, your sub-heads, and your body copy, calls-to-action need to be as specific as possible. They need to "match" the style of your audience.