Reports for Billing

SUGGESTED

I just need a simple report report that shows how much we billed out for the last month and how much is overdue.  All of the reports I am running do not make sense.  The data that comes out is not right.  For instance, it on Aged A/R Balances by Date, it shows a customer with an overdue balance of $285.00.  That customer owes nothing.  It shows in parenthesis a credit balance of $195.00 and in the 30 day column $90.00.  If you had these 2 numbers it would be $285.00 but they owe nothing.

I might need someone more trained to create a simple report but all my boss wants to know is how much we billed for the past month and what the outstanding balances are.  Every report I run, there is an issue with it!!

HELP.

Thanks!