I’m being charged for a phone I returned

I returned a phone to Hiram xfinity store per Associate Ashlan and Manager Chrissy. I am being charged for a phone they told me to bring in to ship to the warehouse. I can’t pay my phone bill because of this charge . Xfinity seems to want all or nothing when I’ve done my part. I don’t want my phone cut off as I have kids to check in on and I’m willing to pay my bill but keep getting push back from a phone I returned in stores. Pull the cameras. I’m beyond upset! Please forward the concern to corporate on Hiram GA Xfinity store.