PLEASE HELP high ping issue which doesnt allow me to game online or use voice or video chat

Is there anyone that can help me with this issue. I get ping that constantly spikes and sometimes stays high to the point where gaming on any devices with any game online is impossible. The same goes for video and voice chat  through games or individual apps.  I had this problem the 1st 6 months of 2020 and now it has started up again.  Every tech that has come here has said there is nothing wrong on my end and the last tech that was here on Jan 12, 2021 said he was 99% sure that it was a node issue and he would put in a call to have someone look at it. The problem is whenever i call or use chat through xfinity, they say there was nothing put in for that. The same thing happend last year where i had multiple people tell me a bunch of things were getting done only to find out weeks later that nothing was done and the requests were not put in the system.  I understand that node issues are probably tough or annoying to fix but having problems for months only to be told what they think the problem is to not have it adressed is absolutly rediculous. I've been nothing but polite and understanding in all my conversations and still nothing gets done. There never seems to be a problem about getting their bill on time though, if its late by 5 min i'll get 20 alerts but to fix a service that i pay 250 for, i get ignored.  1 thing i learned is to never mention gaming with comcast because they will go straight to blaming the games and not take anything you say seriously, even if one of their own techs says its a problem on their end