The short answer as to why there has been no recall is that it hasn't been deemed a safety issue. When the water pump fails, the engine doesn't immediately lose power or stop, it takes a little while to die, and usually you get some check engine light and noise that warns you there's a problem. NHTSA won't force a recall for something that isn't "safety critical". This sucks for you, but that's how they draw the line.
At this point, the only hope anyone has for compensation is if one of the several class action lawsuits against Ford and Mazda for this engine and its design result in a settlement.