Accidentally bought the wrong carwash at the pump. Sent another person in to upgrade carwash. Told Sam that I bought the wrong one and wanted the more expensive carwash. Didn't get a receipt with purchase receipt 1st time. Went back in and got receipt. Went to the carwash and entered it at which point the halfway into carwash I realized it was giving me the original one I had bought. Looked at receipt, and Sam had recharged me for the cheap carwash. $16 later with no carwash I explained the situation. At which time I was told I could buy another but that because I had entered it, it was used therefore he would not upgrade it.. Not sure how I was supposed.to figure out I had purchased a 2nd wrong carwash without the machine tipping me off which requires me to enter it. Maybe someone out there is smarter than I and can tell me how that is done when I received only a number??? Didnt get 1st receipt as I was upgrading so after 16$ my car is filthy and all sam can do is tell me too bad I can buy another.