T-mobile USA

Purchased $3 daily rate from t-mobile to use for 2 days, their website would only take minimum of $10. after using 2 days and removing battery, they still charged me another day. I removed battery at 11:08pm to avoid any additional charge, they are claiming data usage after midnight triggered the charge???? The phone was OFF and battery removed the night before at 11:08PM. I had a suspicious feeling about these guys so I checked balance the next morning and sure enough they charged me! Imagine all the extra $$$$ they get when they screw people like this. I have saved my phone (untouched) as evidence, I am sure it has the network disconnect time in memory. Class action anyone???