I'd go a bit further than JoeTaxpayer here, and explain how you might have helped things along.
We're not really a translation service here. "What is the word for X in Y language/dialect" is not a great question on this site.
Why? Because, in part, what you saw: most of us don't know, and can't do anything more than google what it is ourselves.
But also, in part, because it's not really doing anything more than taking one technical term and making it into another technical term.
It's also not really what you want to know, at the end of the day. What you wanted to know is, what is the term in American English for [the concept that debt prescription means in South African English]? And the way you get to that is by asking that question.
In South Africa, we use the term "debt prescription" to refer to debts that are considered no longer valid after a period of time. An example would be if a person were to owe a debt, and then many years pass, there is a point at which they no longer are considered to owe that debt, and could not be sued in a court of law. How can I refer to this concept in American English?
Brythan tried to help you get to this in the comments, but you didn't take their advice.
The important thing here is to explain the term in neutral (non-regional) language, and to include more information in your question. Your initial question was simply too short and cursory, and while someone was able to guess at what you wanted, that's not really how we prefer to operate here; we're happy to answer complete, clear questions.
We'd also prefer not to have to do work in order to understand the question. Notice the answerer appears to have first worked out what 'debt prescription' means, and then translated it. A good question will already contain that information. This not only gets you a better answer, but it saves the volunteers who answer your question time too.
Hopefully that helps you understand why it was closed, and what you can do to get better answers in the future! Definitely also spend some time reading the faq and the help center as well.