Poor Speed / Tech Visit / Charges

Hello - I have been having low speed issues for the past two weeks. I have had many calls with Tech Support to help resolve this issue---and remains unresolved. They scheduled a technician to come out on 3/15/24. The technician that came out 3/15 barely knew English---he was an authorized agent and not a comcast employee! I had to communicate with him through google translation. He just said everything looks fine and left. 

After two weeks of trying to resolve this issue, I am still only getting 150bmps download speed (paying for 300mbps) and only 20mbps for upload speed (paying for 100mbps)! This is causing lagging as well as connectivity issues.  Spoke to tech support over the weekend and again today (3/19) and was told that on her end, her line test is showing "RED" and "YELLOW" lights, which indicates an Xfinity signal issue. She scheduled another tech visit for 3/20/24!

The worst part of it all---in both phone calls, I was never informed there is a technician visit charge. I only came to find out about this after speaking to Billing----Xfinity charged me $100 for the first tech visit on 3/15/24! I spoke to billing to try to get this waived and they are REFUSING. Why should I pay for the first tech visit that did NOT resolve the issue as it's clearly still outstanding? Also, why should I be charged a tech visit fee for an Xfinity signal issue---in which Xfinity is unable to deliver/provide services I am paying for? Finally, it begs the questions, why am I still paying for Xfinity when I am not getting the speed/service? I have been customer since 2014. I am very disappointed.