We value you as a customer and would never want to lose you! Our goal is for you to remain connected, and we're here to help with your data speed concerns. To gain clarity, do you experience slower speeds during a specific time of the day or all the time? Indoors/outdoors? Are other services affected (calls/text messages)? You mentioned you have the best Unlimited plan.
It is important to note some of our plans do have network management. I've provided a link here: http://spr.ly/66061TG5a with a list of our plans. Does this information help?