WiFi Experiencing consistent packet loss and lag spikes. Cannot work from home, stream, or game

For the past few months Xfinity has given me the run around. I work from home and exclusively use streaming apps to watch TV shows and movies. We consistently experience packet loss and lag spikes resulting in unreliable WiFi all day every day. I just want to know why it is happening and why Xfinity refuses to respond with anything but boiler plate "have you turned it off and back on" type responses. I have attached multiple pictures from Ping Plotter that graphs latency, these were run through my personal computer while connect via an ethernet cable. I am paying more than I should for an unusable product. Xfinity is lucky there are no other viable internet providers in the area.

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