It's was a very odd interaction given that Charter's fine print says that to qualify for the discount you have to not have subscribed to Charter's services for a mere 30 days[0]. Even with limited competition, now with MiFi hotspots a person could cancel their plan, do a pay-as-you-go MiFi hot spot for 30 days, and then resubscribe with the new rate. (Not sure if Comcast is the same.)
[0] "Offers are valid for a limited time only, to qualifying residential customers who have not subscribed to applicable services within the previous 30 days and have no outstanding obligation to Charter."
In my case, windstream is the only wired option.. but they don't seem to realize it.
The service used to be completely unreliable too, but as I've complained over the last few years, they seem to have improved things a bit. It's now approaching the reliability of Comcast (i.e. still not great), but at ~1/3 the speed and slightly higher cost.