Sounds like he/she is just playing with you. You two are not on the same page and likely will never be. That crap is not worth your time, let it go and move on!!!
Good luck
No excuse for rudeness from a retail clerk.
Now, with that said, they are as tired of seeing flippers as we are of seeing flipper prices so see it from both sides.
Call the manager over, explain the situation how you were addressed and see how the situation is handled.