Why was $1 taken out of my prepaid account last month?

msmt

              I have a $30 per month prepaid account.  I always keep $10 extra in the account in case I go over the 100 minute limit.  As I understand it, if I go over 100 minutes, it is 10 cents per minute.  That is the only extra charge I am aware that could be taken out of my account.

     

    This month when I went to add my usual $30 to my account, I noticed I only had $9 instead of $10 extra.  I don't believe I went over 100 minutes last month and definitely not exactly $1's worth of minutes over.

     

    Why did I lose $1 last month?

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