Necessity is the mother of DIY (Do-It-Yourself)
Instead of facing a tantrum, I decided on a DIY project. I had a few cartons of ice cream in the freezer. I had my big daughter go with the little one to the local store to pick up the sprinkles of her choice. I let the ice cream melt somewhat, spread a layer even on the bottom of the round ice cream container, covered that with sprinkles and spread a layer of another flavor of ice cream on top, covered that with sprinkles, covered that with another flavor, and topped it with sprinkle. She was very happy with the cake, declared it delicious. So due to lack of customer service, I ended up with a homemade solution that cost me $10 less than the bought cake would have.