O'Reilly Auto Parts

Just bought a 159.95 battery. The clerk added on 18.00 core fee abd said I would get it back if I returned the old one. I bought the 159.95 battery.. if I don't return one then why am I paying to keep it. The core fee should come off the sale price when I return the old one... right? The clerk said take it up with corporate. when I returned it they took off the 18.00 they charged me for my own dead battery. Auto Zone may be my auto store from now on.
Sal. [protected]@aol.com.