Poor customer service and fraud service plan

I moved to my new apartment in June 2022 and I was told that the internet provider is xfinity who have a router already installed in the apartment. I purchased the super speed plan with 900Mbps speed for $65. I noticed the speed was slow when I run streaming on tv or when I do gaming. I had no way (or I was ignorant) on how to check speed. I tried to call xfinity multiple times but time they transfer me to automated/virtual support which was never successful. Finally, I found out I can check the speed using the following link https://speedtest.xfinity.com/ . To my surprise , I found I am getting between 80-300 Mbps only while paying for 900Mbps. Trying for a month to get in touch with a live agent, finally i was successful by fooling the system claiming I am a new customer! The agent said they will send a technician to resolve the issue, who he came without being able to resolve it stating there is high traffic on the bands/channels knowing most of 160 apartments are with xfinity and using xfinity routers. He stated he will put this in his report and xfinity will communicate back; which they did not. I tried to reach a life agent after that and was not able till Jan. I requested compensation and problem solved. I escalated it to supervisor who acknowledged that I am eligible for compensation if I am not getting the speed and he created a credit ticket number specifying the compensation amount. He requested to have another technician from advanced technical team to visit my apartment to confirm the issue. The technician came and confirmed he could do nothing about it since it is associated with the high traffic. He stated an agent from xfinity will call back for the compensation and resolution of the issue. That was never the case. I had to call again spending 3 hours on the phone and been transferred among 6 different agents to finally spoke to another supervisor who was not professional and was trying to run away from acknowledging the problem blaming me for not calling earlier refusing to give any compensation. When I shared with him that I have already a resolution number that acknowledge my right for a compensation especially that the issue was not resolved. He refused to acknowledge it : once stating he need to confirm it was issued by a supervisor (knowing only supervisor have the authority to do so) and another time stating he needs to send a lead technician to prove what I am stating is accurate (knowing two technicians came before and documented that). In brief, he questioned me, the other supervisor, and two other technicians. Furthermore, he did not care when I told him I will notify my residents to check their internet speed and start to report it individually. Shame on you xfinity for this quality of service  and generating money by fraud through false services. This case will be reported through local and national agencies and will be the root of a legal case especially that I have all documents and recordings that prove my case. In addition, I will go ahead and notify all the 160+ apartments in my complex building to check their internet speed since I know my case is not isolated.