I ordered "Cox Internet Essential 30" which was $39.99 but they somehow changed it to Ultimate and charged $79.99 which I haven't requested.

I am so sorry that there has been some experience with the order not being right. This is definitely something that Cox would need to help address. You can reach us by email at cox.help@cox.com. Please include your name, address, and a description of the issue. 

The purpose of the Cox Internet Forum is to allow customers to discuss technical topics related to residential Cox High Speed Internet services with other customers. If you need help with billing or other account specific issues, please reach us on Twitter at @CoxHelp, visit us on Facebook, or at cox.help@cox.com.