I was essentially charged for nothing...

I recently opened an account with Cox under the Premier service internet package($87/ month). Just today, however, I noticed that the Ultimate($99/ month) package is available in my area. Wanting to take advantage of the upgrade, I put in an upgrade order online. Shortly thereafter, I received an email stating that my order had an issue. So, I called in to Cox customer support to resolve the issue. The tech representative got me switched over to the Ultimate service with no issues... Except for a $75 "professional installation" fee that shouldn't be there. As I was upgrading via the $5 more per month deal, the $75 fee should have been waived. All the rep had to do was switch my service to a higher tier, so I'm at a loss. Please contact me as soon as possible with a fix for the situation.