No proration of a bill is terrible

So.... this is the last time I will ever use any AT&T service.  Here is some background.  I called and cancelled my services and turned in my equipment on 3/2/24.  My billing period is from 2-29 to 3-28.  How in the world can a company bill for an entire month when I had the service for 3 days?  This is terrible business.  In the insurance world and other services companies, a company would prorate your bill for the service you used.  Oh... but not AT&T.  They want to (Edited per community guidelines) you dry for services that you don't use and don't have the equipment to even use their service!  Well... AT&T will NEVER get my business ever again.  If someone at AT&T wants to reach out to me... please do as I will "spread" this horrible policy via social media.... that most of their customers have no idea about since they have been with you forever.  16 years to be exact and I feel like I have been (Edited per community guidelines)d.