How do I make a complaint about the deceitfulness of the online customer service representative?

I am writing to express my extreme dissatisfaction with the deplorable customer service representatives in online support provided by Xfinity on June 19, 2025 at 4:20 pm thru 8:00 pm. My experiences with your company have been nothing short of a nightmare, characterized by incompetence, unresponsiveness, and outright disregard for customer satisfaction. Your representatives are misrepresenting your company. I've been a lifelong customer of Comcast before they were merged with Xfinity and I've tried unsuccessfully since last year to get my monthly service Package reduce to a lower rate and I've been lied to that my new promotional rate would be lowered and includes everything that I currently have.  After signing the new agreement I realized I was lied to, my STARZ subscription was canceled, 2 of my cable box was canceled to allow the lower rate and when I found out after I disconnect with the agent I had to reconnect with another agent and instead of adding back those items that was removed I was told that the rate would then go up again.  That is very wrong, unprofessional and deceitful. I was offered mobile lines to keep my cable bill lowered and those mobile number I don't use because I have T-Mobile with 7 lines and not intention of leaving (glad I didn't). I'm now angry because my bill jumped from $350+ to $399 plus the mobile lines totaling $64 per month that is almost $500 a month.  I'm very angry at this time and I am going to have to research and explore my options with streaming service from Roku and other platforms. I've work for a cable company before and this is the most despicable service I have ever come across. Lying to customers. I'm a disabled person and my husband and I have limited finances and to be paying that much money per month is ridiculous. I'm sorry but I have to try and take my business elsewhere because it seems that Comcast have really declined when it comes to Customer Service professionalism and overcharging customers. I hope someone will see this message because I have proof to back up my claim. I save all my chat transcripts and look forward to hearing from someone about this.