Wrongly charged for Mobile Xfinity

So I moved last June, and since I had Xfinity in my old address, I requested Home Internet for the new address and also decided to use their Mobile service. Mobile service started on June 15. However, when the technician tried to install Home Internet, he said it was impossible because the cables were installed too high and there was no access (the previous residents did not have Xfinity). Second technician comes in, same result. I go in person to the office to cancel home internet, and they tell me that without Home internet my mobile bill would be much more expensive, so I had to cancel that one too and they assured me (and I asked several times) no charges would be made to my account because they have a 30 days period where you can cancel without penalties. This was on June 20, so 5 days of service. Fast forward to August 5, and they have charged me 96 dollars for the five days (including activation fees) we had their service on our three lines. I have been wasting my day today dealing with these people on their Xfinity Assistant chat, and they offer no solution and won't honor what I was told at their own office. I asked to be put through to someone else who can help, they told me to wait, and now closed the chat. If this isn't a scam, I don't know what is.