Bad internet

Hi I have bad internet. Even with 1gb service I never see the 800 that I’m supposed to see at least. On my phone I see less than 500 and on my console which is my main internet use as I’m a gamer I never see past 144 on a perfect day. I’ve tried restarting my Xfinity modem everyday to no luck, I’ve tried calling Xfinity to boost my signal, I’ve tried Having a technician come outside the apartment with no success at better internet. I have yet to be able to speak to a supervisor or someone in charge of xfinity to take responsibility for my internet being so bad. I always get kicked from the agent chat or a supervisor never calls me back when I ask about them calling me back. They decline giving me more credit back when I never get the service I am paying for. I need help from anyone in Xfinity who’s looking at this post