Picked up a new customer this year, a very snobby lady that thinks she is better than everyone else. We already planned to axe her for the next year, we do not keep people like her around. She decided to take it upon herself to subtract some of the charges off of her bill. However she somehow got confused and thought she owed for two months (October and November) even though October was already paid. So she took the total for the TWO months and subtracted money from things that were done in Nomember off of her bill. She really only owed $239.56. She however thought she owed $366.76, then proceeded to subtract $79.20 off of her bill. She sent in a check for $287.56, a difference of $48.00 extra. I hate for this lady to think she got over on us, but Matt insists that I bite my tongue and not tell her, cause he says she aint getting back her 48 bucks. But If we don't tell her, then she thinks she can go around doing this to anyone, subtracting off whatever she feels she shouldn't have to pay. 48 bucks aint much nowadays, I'm more than happy to forfeit that to tell her the real deal...... What should we do??