What are these one time charges on my pre-paid account?


    Despite having filled my account, T-Mobile keep messaging me to refill it.  When I looked at my account there are a number of one time charges on it, and I have no idea what for, but it is showing a balance of nearly $300, for a prepaid account that costs $40 a month.  I can't get hold of anyone at T-Mobile to understand what on earth these charges are.  I only bought the SIM card a month ago to use when I am back in the US later this month and it is connected to WiFi, so there is no data roaming going on (in fact T-Mobile told me it would not roam internationally, but it seems that it does for voice/text).


    What is going on?  How can a pre-paid account end up with $300 of charges on it??

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