My bill shows 3 lines, should only have 2. Tried to correct several times with Xfinity and nothing has changed.

I traded in my old phone with my existing Xfinity line for a new phone on my SAME LINE. I clarified this with the representative. She still signed me up for a new line. I received and activated my phone on my current line. My new phone still showed it needed to be activated even though my current line was on it and it showed the correct phone under my phone number. I was reassured over and over that when they received my trade in this would be corrected. It is not corrected still and today they even tried to give me a new phone number for the bogus 3rd line I shouldn’t have. I’ve spent countless hours on the phone via phone call and live chat and NOTHING has been resolved. Has anyone else had this happen? I feel like I’m losing my mind at this point and refuse to pay for 3 lines when I should not have had that 3rd line added.