Since posting this I have been in daily contact with iTunes support. It took three emails to get a proper resolution and a full refund for the double billing. Thank you Victoria for helping. I was also asked to reset my warnings in iTunes. Here is the link that describes what to do. http://support.apple.com/kb/HT1734.
I also went a step further and checked the submenu asking for emails on downloads and for verification of content that is ready to be downloaded and added to iTunes. Hopefully this resolves the possibility of a double bill for content. If anyone has a different experience or wishes to add, I welcome youe comments here.
Keep in mind that each and every time I contact the support group I try to do so in a positive and constructive manner. As an ex-Apple employee I know that kindness and perservierance works better than threats and intimidation. They really do want to help but in most cases the initial person we deal with is not empowered to affect the resolution required.