Xfinity fullfilment of promises

I am having issues w/ my account and cust. svc. I'm trying to reach the Executive Office Team. I logged in  (user_o2urhu), but having trouble navigating the site to send a msg.. I sent a msg. through Facebook, but no one responded. Here's my problem, pls. call me. Thank you.:

I signed up for 1G Xfinity internet in Feb. after I moved into a new bldg that was wired for Xfinity. I got around 200 Mbps. 

I trade stocks daily, and speed is important. That speed (200-300) is not workable !.. I lose 'real' money when I have a slow connection to the market and my brokers.

Since then I have tried to cancel twice (since I still have my Verizon router up). And I talked to (literally) over 20 Xfinity people. They are mostly nice and say they are trying to help... and they end up "changing my plan in order to solve the problem"... (I guess it is their sales commission at play.) All of them sold me "guaranteed" deals and speeds ("you have my word").

But those were false promises.

Now the problem is that I am getting many fees and charges, and of amounts that I do not recognize. We need to sort this mess out before it gets worse.