This sounds vaguely familiar to a Sprint bill I received 9 years ago. Sprint attributed a six gig data charge to a phantom video attachment to a phantom e-mail I never received. They dropped the charge and promised never to try that again.
College Student Goes To Cancun For A Week, Comes Back To $11,667 Sprint Bill - The Consumerist
College Student Goes To Cancun For A Week, Comes Back To $11,667 Sprint Bill - The Consumerist