File a complaint about servcie after got new modem

Got New modem after we upgraded our service; new modem came and hooked it up. But none of our servicing worked/ had to contact customer care through my phone a do a chat session on my phone to get our servicing working again. I work from home and have a company computer that i use for my work/ after getting new modem set up and working/ my work computer would not let me log in/ Said VPN connection issue. I spent several hours using the virtual assistance and then 2 live agents on chat and got told they could not help/ set up appointment for a tech to come out ; but was several days later in afternoon. This a happened Friday the 27th--So I missed 3 days of work, cause soonest they could get a tech here was late Sunday afternoon . After appointment set up next day get call that Issue was with my works computer and they wanted to cancel the appointment -i said no because before the new modem my work computer worked just fine. Advised I wanted the appointment so some one could tell me/ explain why suddenly after new modem my work computer could not connect; cause no one online chatting would say anything about that; would noly have me redo things i did before i contacted them and also no affer of a tech connecting virtually to check my system!  I happen to have a service contract with PCLAPTOPS-they rebiult my home computer tower for me. I contacted them and they were able to get me an appointment to speak to one of their techs on Sunday afternoon. Guess what - took that call and explained what happened/ that tech advised first would walk me through some things to check and if  that did not work would do a live connection so he could check out my system/ Well guess what after me giving him full story and every thing i  had done  and the same things xfinity chat support wanted done. He wlked me through some thing is my Systems settings - got them set up for that VPN to work along with My Norton 360 program which also has section about VPN on my computer.  After we got those all set and represhed and rebooted System; My Work computer was back where I copuld login.  

So Basically Xfinity Cost me 3 days of work; put my job at jeopardy; basically from their chat support being either not fully trained on actual troubleshooting/ or I hope this is not the case- they did not want to deal with the problem. After they called and said My Work company had to resolve  it after they had set up appt for a tech - leads me to believe they wanted to avoid the issue/ Cause another Tech FROM PCLAPTOPS was able to get it resolved and did not have to contact my Work company techs, which I knew I did not.// My Tech issue # /[Edited: "Personal Information"] You would think a Customer of over 25 years could get better service// MAke s ya wonder!! A very Concerned Customer