Moving & transferring service & was DENIED equipment credit

I am a disabled Veteran and have been an Xfinity customer since 2009.  I have been paying Xfinity at least $100, at any given time, every month for the past 15 years.  That's at the very least $18,000 I've paid Xfinity.  I am selling my home and downsizing to an apartment.  I will be transferring my internet & Flext service to the new apartment.  I currently have Xfinity Home with 2 cameras, several motion detectors, a doorbell camera and the hub.  I will be discontinuing the Home service and have a small balance due on my equipment.  i will no longer need the equipment and it will stay with the house.  I put in a request for my remaining equipment balance to be credited and my request was denied!  Xfinity can't credit me a measly $300 after all of the years I've been a loyal customer through all of their price changes and different cable & internet plans.  I am going to look for another provider in my area that respects and appreciates their veterans and long-term customers!  Xfinity just lost mine, my family and all of my friends' business.  I plan on telling all of my buddies at the VFW as well!  Absolutely ridiculous!!