I am being charged for an Apple Watch that I exchanged at the xfinity store in North Haven CT

Purchased An Apple Watch as a Christmas gift for my wife on 12-06-2024. Found a larger xfinity Rewards that I qualified for. Ask the sales person if I could return watch to get larger Rewards. He set up an appointment for me. Thought it would be a simple paperwork transaction. Was told that they needed to take original watch back and sell me a different one. Spent about an hour and a half at his desk while he and manager tried to figure out what do. Finally was told everything was all set, had to make a first payment for new watch, and that I would receive refund for original first payment in about a month or two. In October, I noticed that I never received refund. Doublechecked both credit card and payments to xfinity mobile and found that I was still making monthly payments for the watch that was returned. Contacted xfinity customer service who said I had to take it up with the xfinity store. First meeting was a disaster: remote strore manager agreed that there was an error and she would take care of it. Next day found email giving me a 2 month credit for watch we have. went back to xfinity store and talked to assistant store manager [Edited: "Personal Information"] about the situation. He copied emails I had with Sales associate [Edited: "Personal Information"]. Said that his store has detailed records of all items and that he just needed about a week to resolve problem. I waited 2 weeks and asked for an update. He replied that he was very busy but would get back to me with an update that same day. I have now gone another 2 weeks plus with no communication from him, even while asking for any updates. I have many pages of notes (timeline, emails and text messages) that put into question why I am still being charged for this watch. All communications on my part up to today have been polite and cordial.