Late Fee Waived

I pay bills twice a month and two weeks ago, there was a breakdown in my bill paying system. I was excited about visiting my niece and nephew and was paying bills right before I left. I thought I paid all of the bills that were due. I even recorded in my Excel spreadsheet/checkbook that I had paid all of my bills. Late last week, I realized I forgot to pay one of my cridt cards and they immediately charged me a late fee. I hate that I screwed up. But I immediately paid off the entire account balance and vowed to call them this week to ask for a refund. I prepared myself to go to battle today so I called BP Chase and politely asked them to waive my late fee since I have always paid my bill on time. They promptly (and without further whining from me), refunded my account. SCORE! BP Chase has forgiven me, I have forgiven me, and now I just need to not make that mistake again.