Billing Issues - wrong biling

Hi ATT,

My ATT account#[Edited for privacy.]

My bill with Jun,2014 has wrong billing, which says the past payment due carried though I have paid them on time.

Also, I cancelled ATT service on 1st July,2014 but still I see the billing is not corrected in the final bill. The final bill has past dues carried forward.

I talked to Customer Care, but was not helpful other than keeping me hold on phone without any conclusion and finally routed to the default waiting line with no one responds.

Thanks, Pradeep