Data usage and rollover. Customer loyalty!

If we are paying for 1TB of data and only use 850GB then why doesn't COX offer rollover? Should we get a discount for not using all of our data? It's an item we purchase and then lose it if we don't use it. COX has overall great service and pricing compared to the other options in North County but still there is a lot of room for improvement especially with customers that have been faithful to your company, return the favor for your salaries.