Public xfinity Wi-Fi not working

I buy the $10 Wi-Fi pass every month and every month for a week to two weeks. It literally stops working like specifically in my apartment. I can step outside go either left or right of me and it works fine but the minute I get inside my actual apartment. It doesn’t show anything. It either won’t connect or it’ll say I have a full signal, but I don’t have any Internet connection. This is very frustrating because every time I call Xfinity they assume I’m talking about my own personal Wi-Fi and for some reason, they do not understand that I’m calling about public hotspot. Is there anyone that Can’t help me figure out this problem, please. Again, I don’t have a modem or anything like that. This is literally the public Xfinity, but for some reason it works inside my apartment on and off.