Bill payment not posted?

Hi 

My ex husband switched over my account to my name and when I paid the bill it did not post that I paid for it.  Is it because I have a new account? When I logged into the phone number and paid the bill it stated it posted to my phone number. 

But I received mail from att stating that I have a $86 CR on this phone number but not on this current bill.  Could I have two different account numbers for this phone number?  I was told it was combined.  

I even have the suntrust account info stating I paid the bill.

My phone number is 305-798-0286.

Sarah Mendieta