CreateChildSymbol, then Delete it?

Hello,

I'm trying to delete a symbol after I have created it. At the start of my main timeline, I can create a symbol without any issues. But trying to then remove that symbol is a problem, it just wont do it... It keeps added the same symbol one under another (timeline is on a loop). This is on my first frame:

sym.createChildSymbol("Food_Spanner", "DropPoint");
var food_sym = Food_Spanner.getSymbolElement();

Then about 15 frames later:

food_sym.deleteSymbol(); //nothing

//so I try this:

sym.getSymbol("Food_Spanner").deleteSymbol(); //nothing
sym.getSymbol(food_sym).deleteSymbol(); //again, nothing

What am I doing wrong here?