Because if you were scientifically literate, you would not be using those terms like that or agreeing with that dolt bigblue. A theory and law are two different things not stages to be taken on a path.
A theory is an explanation for how and why that incorporates facts, laws, and testable hypothesis. And it will only be accepted as a theory if it conforms to those facts, laws, and the hypothesis that make it up. After a certain point, a theory becomes so strongly supported that new information that could have falsified it before is instead used to refine and make it more correct. It can never be proven, only falsified because nothing can be 100% tested for every possible circumstance.
To quote Einstein, "No amount of experimentation can ever prove me right; a single experiment can prove me wrong."
While a law is a generalization that will be true with given circumstances. Like the 2nd law of thermodynamics, it's going to be true so long as it's in a closed system. Or Ohm's Law for an electrical circuit, which is one of the laws that make up electromagnetic theory. The key point is that they are only said to be true given specific conditions they are not universal.