Most probably you are not paying the lowest possible price. However, you might be paying relatively lower than what you would be paying if a monopoly had existed rather than a duopoly. Both situations are bad, it's kind of like choosing between being in the frying pan or in the fire.
We have an ecosystem that is quite diverse i.e. phone service, broadband service, VOIP, wireless communication and so many other types of networks, given my way I would like to see a half dozen providers in every segment, in other words, more competition.
Globally, only 2 billion people are connected to the internet and 5 billion people are not connected. In a competitive environment businesses tend to seek out new sources of revenue, if competition is already at a high level in the US market then why do I see more EU and Asian service providers trying to expand?