I'm working on my second ever filled cake. This one is a half sheet double layer. I piped my dam, (I even did two rings of the dam), and then put my raspberry filling in. I made sure not to fill above the dam. It was at least a full inch from the edge. Then I put my top layer on and had to fridge it cuz it's cream cheese frosting. I left it in there about an hour to settle before I frosted it. Oops... had some leakage. I tried to clean it up, shoved it in, piped some more frosting on the edge, and then frosted the cake. This morning there's still a tiny bit of leakage. Is there anything I can do to fix this now? Guess I need more practice, huh? 
I would prob try to get it cold and than put a thicker layer of icing on. That is about all you can do, it sounds like you just put to much filling in, it is suppose to be a thin layer of filling. Hope it works out
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