I was charged for an iPhone that I never took

I went into an Xfinity partner store back in early January to purchase a new iPhone 15 and after noticing that the clerk had grabbed the wrong color, I told him.  He said they didn't have the color I wanted so he was going to have it shipped directly to my home but to hold onto the 'wrong color' iPhone since it was activated with the correct phone number already, and to bring them (the wrong color and the delivered phone) back to the store so he can do the number transfer and take back the 'wrong color' iPhone.  Four days later when the correct iPhone arrived, I did just that.  One month after that, I noticed a charge on my credit card for $1170.  I called in and they apologized and said I would be getting a refund within 5 days.  I've called in at least 5 times since and spent hours on the phone with 1-888-Xfinity1 and now i'm being told that the phone may have been stolen by the store clerk.  WHY AM I BEING CHARGED FOR A PHONE I DIDN'T RECEIVE FROM XFINITY??  Why am I responsible for the theft of a phone from within the Comcast organization?  Why am I spending hours on the phone trying to get money back for a transaction that should have never taken place?