Exxon Service Station Purchased services not provided Falls Church, Virginia

I visited Exxon at Loehmann's Plaza 4784823 in Falls Church, VA. this evening.  I intended to use a car wash that I purchased on 10/26/2011.  After entering the code from my receipt at the car wash, I received the message that the code
had expired.  According to my receipt the code indeed had expired on 11/09/11; I did not know that the car wash had an expiration date as it is a service provided by the service station on a daily basis.  I went inside to the station attendent and requested a valid code so I could wash my car or a refund so that I could repurchase the service and wash my car.  The service attendent, Kidist, refused stating that she was not allowed to give either a refund or issue a new code.  She did very little to assist me.  I asked to talk to the manager, but there was no manager at the store.  I asked her to call the manager; or someone that could assist me and she refused.  I again requested a refund, but she refused.  She asked if I wanted to talk to the manager and I said yes.  She picked up a cell phone and I expected her to call someone, but she did not.  She proceded to write down a phone number.  She said I could talk to the manager by calling the store tomorrow; the phone number she was giving me was the number to the service station.  All I wanted to do was wash my car.  I wanted the service that I had already purchased.  To me this does not seem like an unreasonable expectation or an unreasonable request; as I purchased a car wash; I did not used the code issued to me on my receipt; I had my receipt; and the car wash was open and appeared to be servicable.  I still do not understand why the attendant could not issue me a new code or refund for the service that I purchased but did not receive.  I find this customer service unacceptable.  I realize that my code expired, but I would not expect a non-perishable service that does not expire to not be provided once purchased.