Charge $100 for technician without inform or choice

I moved to a new appartment on 7/28/2023. As a 2-year xfinity user, even though I was informed that the apartment might have some problems when using xifinity, I still choose xfinity and changed address for service that day. 

The local xfinity store took my old xfinity router and give me a new router, saying it is a update. Then things happens, I followed the steps to activate the service for my new apartment. But it doesn't work at all. So I called the custom service to help with the activiation but they are completely helpless and said the only thing they could do is to send a techinian. I thought it might be the probably with the router as my old one works so well at my old apartment.

So I went to xfinitiy AGAIN to switch the router. Guess what. This time they gave me a piece of crack. The router has no light on when the charge cable is connected. This time I called two customer agents via phone and one via the text. Again totally useless, the only thing they could do is to told you to unplug the cable and restart the router. But the second router is totally cold. It has no electricity at all. Of course it is not the problem with the plug, as I checked with plug with my phone, it got charged. So all of three guys begin to say there is nothing they could do, the best method is make an appointment with the techinian fo fix the problem. I think it might be the problem in the utility room of the apartment so I can only have that appointment.

But I still go to store for the THIRD time that day to change the router and try again. They admit the second router they give me is broken even though it was brandly new. This time again, the customer agent repeat the same words and ends with the semester "there is nothing they can do about and only thing is to send a techinian".

Notice that all the customer agent I contacted no matter it was via phone or text (More than SEVEN PEOPLE in a day), they all say the techinian is the only solution without mentioning the cost!

After the techinian came, a man can barely say any english. It is so hard to communicate. Actually you don't, cuz he barely said any word except asking for something to drink. And I gave him 10 dollar tip, because I think  so naively he at least fix the problem and the service is free!

When I ask the charge via phone again on 9/3, they said it will be reported and I will get an email to followup. Nothing come to my email that week.

Today, I called them again. They said because the router is functional and the problem is because the cable that connected to the outlet is other carriers(Some carrier starting with letter V). So the techinian helps you to reconnect the cable is reasonable charge.

Funny words! This is how you trained your customer agent? I choose your service and now your charge me for the previous tenant use other carrier? And you guys want me to use your service by reconnecting the cables behind wall with your instruction with four lines?

I did my own survey. It is first illegal to force some people to use the service without inform the charge. I see some agents mention that if you agree the technian to come, then you agree the charge. This word is also not correct as it is not consistent with the customers' expection (I choose your service and there is something wrong I couldn't fix, so it is reasonable that it's your responsibility to fix that. And it is also the case when I use other provider before they set up the wifi for free)

Also even the technian comes, diagnosing problems with wifi is free of charge. The problem with this step is, the technian choose to install the wifi himself without inform me the charge as previous agent. He could have tell the problem and I may can reconnect the cable myself (it is not hard once I know the problem is with the outlet). But I have no choice for that approach before the technian set up everything which is also illegal.

I should have stopped using xfinity by the time I moved to my new apartment. No wonder why all the outlets in my apartment connected to other carrier's cable.

@Xfinity Support