data service roaming charges

Please explain to me how dose data service roaming charges arrive. I was in Europe for three weeks and did not use internet at all, but i returned with $5000 bill from t-Mobil for data service roaming. Any idea how to deal with this s***?
 
You specified your carrier, but failed to specify your phone.

Some phones are constantly connected to data, no matter what...all the time. If this is the case, the charges are valid and there isn't much you can do.
 
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