Tech Support Call Wait Times/Slow Speeds

I have been getting around 0.4-10.0 Mbps no matter where i put the gateway in my apartment. In the app the highest connection quality i get is "good" and if it gets that its a shaky 10Mbps. Most of the time the signal is weak. If i take the gateway outside away from any walls i get 30 Mbps download and 40 upload and in the app it says my signal is very good. But still never see excellent signal. I have factory reset the gateway completely multiple times and I still cant get fast speeds inside my place so I think its time for me to cancel.