Fraudulent sales and incompetent support

I recently received an email offer from Xfinity for an iPhone 15 at a discounted rate with trade in of my old iPhone. I contacted Xfinity sales and agreed to a trade in with a monthly payment of $15.00 for the new iPhone 15. 

After receiving the phone and returning the old phone, I see that there has been a new phone number created on my account. Obviously, the sales agent was unable to create the trade in transaction without creating a new phone number. I called support again to get the number removed from my account and get the deal corrected according to the agreement I had made on the phone with the original sales agent. 

Since then, I have made at least ten more phone calls to support and talked to incompetent agents in at least three different countries. I have been on the phone or in chat with support for over fifteen hours. 

I replied to a chat from another customer who had a similar experience with sales, and then I posted a chat message to support. I received a threat of being removed from the support community because it is against the rules to post an unsolicited support message (according to the threatening reply I received). This is ridiculous. 

Fifteen years ago I quit AT&T because they off-shored their customer service. Today, Xfinity customer service has surpassed the incompetence of AT&T by a mile. I talked to agents in The Philippines, India and Egypt. Not one was able to rectify the issue, although every one of them assured me the problem would be fixed. 

Today, the additional line still shows up on my account and I am being billed $35.00/month for a phone I agreed to pay &15.00/month.