The first problem within scientific understanding is the misunderstanding of the word theory. In common usage we refer to theory as a guess or conjecture, however, that is a slightly wrong outlook when applied to scientific theory. A theory explains why things are the way they are.
I found a good definition for it use-
"a proposed explanation whose status is still conjectural, in contrast to well-established propositions that are regarded as reporting matters of actual fact" (dictionary.reference.)That means that a theory is still a "guess", but one based on facts. So, here is the kicker. There is NOTHING above a theory. A theory is what you ultimately strive for when it comes to explaining things.
A law on the other hand describes the universe. Lets take a example:
First lets take Boyle's Law- (Wiki Definition)
is one of many gas laws and a special case of the ideal gas law. Boyle's law describes the inversely proportional relationship between the absolute pressure and volume of a gas, if the temperature is kept constant within a closed system.Boyle's law describes and observation of a explicit event however it does not conclude the explanation for why it happens.
So, in essence, they both can work together to give a complete understanding, but a theory is NOT a unproven law. Its a very important concept to grasp whilst arguing idea changers such as evolution. It is a true statement to say that evolution is a/only a theory, but in most cases people are referring to the common usage and that is not right.
Theory- Explanation based on facts and it can be proven wrong however it is our best understanding for the why.
A theory cannot become a law nor a law a theory