Annoyed!

We moved into a brand new build apartment where Xfinity was already installed in the apartment for free. We had the option to bump up the speed and pay more, which we did. We did everything we could to get it to work, but nothing worked. We talked on the phone. We chatted through live chat. Nothing worked. They determined that we needed to have someone from Xfinity come to our apartment to see what the problem was. We were never told anything about a $100 fee. Now a month later we have a charge for the extra $100. So annoying!!!