My service experience was subpar this time. I came...

My service experience was subpar this time. I came to order a replacement key and was told to go through the service garage. A service representative Michael was assigned to me. He had squeezed me in between his appointments. He had some subtle Bose headphones playing some music while taking my order. After spelling out my name for him he was able to pull up the account for the vehicle but some how placed my key order on the account of another patron. I only caught this after reviewing my receipt. Ok, honest mistake and I trusted that he will fix this. They told me it will take 3 to 5 days for the order. On business day 5, I left a message for Michael but I get no reply. On business day 7 I emailed Michael and get no reply. Day 8, I called Parts and they said they have the key. I would rate the service low for Mercedes standard due to lack of responsiveness.