Same thing hacked

Same thing happened to me, luckily I only had 28 bucks of credit on my account, it got me for 25 bucks worth. Dont know if this has anything to do with it or not, but I had recently installed an app called rack stare, played it then deleted it. I wonder if this app had anything to do with this mysterious download.

Darink300zx about 掌上三国