Sounds like the same kind of scams you run into at the airport: dirty passort $50 fine (paid in cash)
The extortion the cops commit. Tourists passing thru can be easily targeted by cellular company employees.
I would point out the steady, average data usage before you got anywhere near Mexico City
Next time, use this Free Data Tracking App. It tracks every single bit of data and wifi usage. It even logs the usage and can send an email to a user-selected email address...
E-Office Mobile Data Alerter (trial)
ITS TOTALLY FREE FOR SINGLE LICENSES!!
BlackBerry App World - e-office Mobile Data Alerter - trial
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