If it isnt correct, then don't say it is.
Unresolved questions do get prodded and poked automaticly every now and then to get more attention.
Edit: I was looking for another question that would have been fantastic to quote, but I can't find it. Instead, take a look at this one
If the answers on your question slate don't suit or solve your needs, don't arbitrarily accept any answer just for the sake of a higher accept rate. 70% and higher is good, but you don't need to shoot for the 100% moon.
Wait some on the lingering questions, it's fine, really it is. Not all questions have to be solved and green-boxed out of vision within a day.
If the information landscape around that question changes, you may see an acceptable answer pop up. An answerer that would have otherwise not seen or bothered with your question if you did accept one willy-nilly.