Got scammed, Xfinity won’t make it right

Got scammed out of 500$ by people pretending to be Xfinity, 1800 number, the correct hold music and recordings, promo was to pay a year in full then 2 years with half priced bill, said they were partnering with target. These guys are good, had access to my account and paid my current month of service which showed immediately but of course bounced in a couple of weeks. Talked to fraud department and reported it with the phone numbers they called me from etc. Now bill is overdue, called customer service and they offered to take off the late fees and that’s it. All I wanted was to be credited for that month of service considering they had my info and made a payment. I’m not asking for much, already being down 500$ I thought they would take care of their customers and value their business. No apology, just dismissing that scams happen and that Xfinity would never call customers. I just want what is due considering the events that happened which is merely a month of service credited to me. Seriously considering changing service providers because I don’t feel valued or taken seriously. Xfinity make this right, I’m spending 800$ a year or so, I’m not asking for much. I just want to be respected and taken care of.