There are a number of legitimate reasons why a site that was listed is no longer listed, including:
(1) It was originally listed by mistake and that mistake was discovered and corrected.
(2) It was listable when it was first listed but no longer meets the requirements for listing and so was removed.
(3) It was listed in the wrong category originally and was moved to the right category for rereview.
(4) It was unavailable when an editor reviewed it or triggered an error when one of our automatic link checkers checked it and so it was unreviewed temporarily.
If it was 3 or 4, then an editor will eventually rereview it.
I have submitted through that route already but wanted to know if there was any other ways to get more information on the matter at hand as I feel it is a mistake possibly or malicious.