I was wondering how long it would take until someone brought that up.
A hypothesis is that which can not be proven, only disproven not a theory.
According to the National Academy of Sciences (NAS), a scientific theory is "a well-substantiated explanation of some aspect of the natural world that can incorporate facts, laws, inferences, and tested hypotheses."
A law is a generalization about nature such as the Law of Gravity. No amount of proof or validity can turn a theory into a law. Theories are specific.
Furthermore:
In addition to the theory of evolution, meaning the idea of descent with modification, one may also speak of the fact of evolution. The NAS defines a fact as "an observation that has been repeatedly confirmed and for all practical purposes is accepted as 'true.'"Scientific American
Theories can and are proven. They are then used to predict and explain.