fradualent mastercard charge

I got a bill from MC today which surprised me since I hadn't used it in about 6 months. There was a $25 starbucks card reload charged to my account. I called customer service and they immediately replied that it was fraud and they would remove it and issue me a new card. Since they didn't even question me about the charge I assume that multiple accounts have been hacked or whatever ..... so if you have MC you might want to closely examine your statement!