Thank you so much ladies!
I have the cake in the fridge for now and that has stopped the oozing. But once it sits out of the fridge for a little bit it starts up again. I'm worried it will be a disaster when I go to decorate it.
I do have left over scrapes and buttercream so I'll try that method. If that doesn't work I think I'm going to make a new cake. Or maybe keep that one and still serve it, but make a new cake for the bottom layer of my two tiered cake. I'm afraid it is going to be a royal mess with the weight of another cake on top of it.
This is the first time I tried this filling I guess you live and learn!
Best to make a new one, if you're uncertain.
BTW: The weight of the top cake should not rest on the bottom cake. The dowels inserted in the cake should be carrying it.