Well, I think I've exhausted my options here. I'm not overwhelmed with joy or anything, but I think I'm about as satisfied as I'm going to be.
First, I received a new statement that shows the "overage" I paid was actually my next month's service. So, the only overage I had to pay (other than hours of time) was the $6.50 for the "moneygram".
I received a call back from someone in the Office of the President. I received an "I apologize" and a "Since you are already receiving the AAA promo and other discounts, our system will not allow me to add any further credits to your account. He also mentioned that even though he worked in the President's office, it really didn't give him much power over a CSR.
I pressed that I should at the very least get the $6.50 I paid for the moneygram back. He said he was able to use a "back way" in the system to apply this credit. He also took the "bad" credit card off of my account, and says there are currently no payment restrictions on there.
I explained that I still have a sour taste in my mouth from the whole ordeal. Hopefully throughout the rest of my time with D* they will make it up to me with better service.
I've spent too much time to go much deeper that I already have -- time better spent enjoying the weather, watching some HD, and worrying about more important things.
Thank you all again for your advise, your PMs, and your understanding.