Upload Speeds

I'm an existing customer and I'd like to upgrade my upload speed.

On the xfinity site in the Build Your Plan page where it says choose your speed it says the 150, 300, 500, and 800 Mbps plans all have "Typical upload speed 114.98 Mbps." I currently have a 300 plan and get 20 up. 

I was chatting with an agent named Nina a couple days ago asking about this and she said "Nina: The upload speed number for the Xfinity Connect More 300 Mbps plan is incorrect. The actual upload speed for the Connect More plan is 20 Mbps."

So if I'm shopping the Build Your Plan page to upgrade my plan and the upload speeds displayed are incorrect how do I proceed? The gigabit tiers do have a different upload speeds listed but are any of the upload speeds displayed correct? Where can I go to see the official actual current upload speeds for all the plans?

Thank you