I was out all day yesterday, and when I came home around 3 AM I discovered that someone used my gamertag yesterday. They played FIFA 12, a game that neither me nor anyone who could potentially access my account owns. Upon further investigation, I found out that they also spent 2,760 MSP on a "PREMIUM GOLD PACK". On the billing history, the transaction looks really shady; it shows up as 23 different transactions, each worth 120 MSP. I'm pretty sure that the premium pack costs much more than 2700 MSP too.
Now ready for the weirdest part of this all? This person did not make any charges to my credit card, or change my password. I was able to change it this morning. Anyone have an idea as to what could have possibly happened to me and what I should do?
Something just doesn't add up here.