In a COPY of your document...
Search for [space]"[space] and replace with "[space]

That will help with some of the misplaced quotation marks (the first example) but not those which are followed by some character other than a space. I can think of no way to fix that (other than sending it back to the source).

You could change all of the marks to straight rather than curly, but that doesn't really address the problem.