Was told by agent that installation charged would be waived, still got charged

I had xfinity tech come to the house I moved to, in order to reconnect cable line so I could get service.

When I set up the appointment on 10/11, the agent told me in writing that all the charges would be waived, and confirmed later that there would not be a fee.

Nonetheless there is a $100 tech fee on my next bill. I understand that this is policy, but I'm unhappy that I was SPECIFICALLY told ahead of time there wouldn't be a charge for the visit and it ended up not being honored. I had other options for internet service and had I known I'd be charged, it would have made more sense to go with the competitors.