Good morning earlupta,
Thank you for your patience while I tried getting more clarification on these billing processes. I haven't gotten the confirmation I needed, but I'm fairly certain I know what happened in your situation.
The due date extension (DDE) option is for those who haven't paid off their current bill and need extra time to do so, not for pushing back the due date of a future bill. In your case, you were paid up, so the DDE applied was useless.
I believe we do have another option to schedule payments, which I think would've been a better option. I'm sorry for any confusion and inconvenience.
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