My unpaid liabilities are still $100.

I have an outstanding debt of 10 dollars.

Our records show that the invoice No.1111 is still outstanding.

If an oversight is the reason why you have not paid, please send us the amount due, and let us solve the problem immediately.

I gave up on receiving the unpaid salary.

This is the second mail we send you referring to the invoice No. 1111 which has not been settled.