I'm so upset; I just left the parts Dept ; Mercedes of Miami; I called the night before; ref; my key was not working; may need a battery; Was advised to come in for a battery next day; ( closing ) Upon my arrival; four; four attendants at the counter; no body acklowleged me; after a few minutes I walked over to the cashier: came back ; still no response; I'm livid now; rge first finally asked : as he looked from his computer; cab he help me; I explained I Needed a battery for my key; he implicitly stated ; they don't replace key batteries; I told him ; parts stated I could come in; and get a battery for my key;" well we replace car batteries" Another attendant stepped in : took the key; saw that there was no light:asked if it opened the door; I'm 38 hot now; he sensed my agitation. Took the key; emptied the two batteries; and told me it would be $10. I can't believe the extremely bad customer service ; AND the inept attendant of his job duties; this is NOT my first Mercedes; my intent was to look while I was there ; for my THIRD one;NOT!!!!!! I expect more; people pay too much money for a vehicle; to get horrible customer service: I feel snubbed!!!! I'm pissed!!!!!