I'd still take it back. Say you thought it was the flavor of rice krispies. I mean they have cake batter icecream now, who knows what is next.

You're not happy, mom's not happy, let them suck up what the price was and let you get a cake that will be appropriate.

Just try it, be honest and just say this is what we thought, wow were we surprised, and mildly horrified. LOL.