In XXXX of 2015 we sent in XXXX payments for both bills that were due in XXXX. When we submitted the payment, AES applied the payments incorrectly even though they were the exact amount shown on both statements, in which we sent XXXX separate payments so this type of error would not happen. 
We proceeded to contact them when we received a statement for {$0.00}? Not even close to amount we were supposed to have due. We called and spoke to their customer service. They said they would get it corrected and reapply the payment properly. 
We received a collection call a week later. We then came to XXXX they did not correct the issue, we had them look up the account and the person we spoke with said and confirmed it was not applied properly to be fixed and that she would make sure it was done. They then proceeded to tell us that there is a past due amount now and that the correction of this will fix the problem and we would not receive any late fees from their error. 
A week later we received another collection call ... We re-explained the story again which they were able to see their account notes ( why do they not check their notes before they call? ). They proceeded to tell us we had a past due amount in XXXX, which is not true because we paid everything due. Our XXXX payment even as of this date writing this complaint is not even late yet? So any amount being past due is due to their error from XXXX. We escalated to a manager and retold our story again after the last manager was conveniently disconnected. So we are on our XXXX call with AES and still no resolution.