I just paid my internet/TV bill, they charged the amount and now there is an addition

#1
I am seeing an additional $1 charge from AT&T on my credit card. I know it is only a $1 but why is this extra charge being charged if I paid my bill in full?

This question, "I just paid my internet/TV bill, they charged the amount and now there is an additional charge.," is about DirecTV channels, programming, equipment, and sports.
 
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