Equipment return Text I owned my own

This is the 4th time I have made this post. They keep disappearing when I enter and saying error. 

I cancelled my Internet service on 7/3 and verified on the call that I owed nothing and had used my own modem for my service. I received a text today saying I had Xfinity equipment and needed to return or be charged. I am a bit angry. It shows on all my bills I had my own equipment for the last 18 months when I upgraded plans and I turned in my old modem to the same store in Shreveport the next day. If I still had Xfinity equipment your company would have charged me a monthly rental fee. Please get this straighted out and let me go in peace. I changed to ATT fiber in June for 2 reasons. 

1. ATT fiber cost less for almost double the speed and this is the price no doubling my price after my special is done. 

2. Xfinity customer service on equipment is horrible. It took far too long to take my returned equipment off my account 18 months ago and lots of calls I don't have time for. Do better

Please look at my account I closed. I used my own modem for Xfinity when I upgraded at the Shreveport store off Youree drive and returned Xfinity equipment to that same store the next day. 

I feel like this is a way to try and charge me money or punish me for leaving. If I had equipment the cancellation representative wouldn't have told me I was done. She even verified I had used my own modem. You can verify this looking at my old account. If I am charged for equipment I returned over 1.5 years ago I will be furious and not let this go. Your company needs to do better because on Reddit this seems to happen to a lot of customers who switch and cancel that used their own equipment. 

Thank you

Linda [Edited: "Personal Information"]

Shreveport Louisiana