Unbelievable

I decided to take advantage of the $700 trade-in for my iPhone 12 and upgrade to a 14 pro max (gold) in the end of July. Order was on the way, trade-in was shipped to Xfinity. I changed my mind on the color (to black instead), so called “customer service” before my upgrade phone was even arrived. Customer service assured me that it is being taken care of, will get the desired black color and just send back the gold one. As soon as we hung up and checking my email, see that customer service set me up on a new line and another phone with a trade in (for the iPhone 14 pro max gold I originally ordered and haven’t even received yet) instead of a simple exchange!? Called “customer service” immediately, but claiming that they can’t do anything, order can’t be cancelled.. I visited my local Xfinity store, advised to bring in both phones after they arrived, and they will swap it for me, and transfer the $700 credit from the gold iPhone to the black one. Went back to the store with both phones, activated the desired one (black color), and for some reason they left activated the exchange phone (gold color) as well with the same phone number under both phones, and assured me that the $700 credit is being moved to the black IPhone 14 pro max after Xfinity receives the original gold color. Fast forward after about 10 hours on the phone with customer service and 5 times in the store, I got three emails at the same time saying that 1. the actual trade in iPhone 12 arrived, 2. condition is great, 3. credited my account. I checked my account and the $700 credit was applied to the return gold color iPhone which was already sent back to the xfinity warehouse. Two days later I received the email saying that the return gold iPhone 14 pro max arrived in great condition and I am getting my refund for the phone. At the same time, my $700 credit disappeared  which should have been assigned to the black iPhone 14 pro max I am actually using. Instead I got a $172 line credit. Called customer service again, (at this point I knew they won’t help though) and she’s telling me that I got the $172 minimum credit for a trade-in iPhone 12 and the best I can do is to visit my local Xfinity store?! But I don’t want $172 credit for a mint iPhone 12. If I don’t get the $700 credit for it, then I would like to get it back. If I had known that the $700 credit won’t be transferred for my exchange phone, then I would have kept the original order (gold) iPhone. Now here I am, customer service messed up the exchange, the store employee made me swap the phones without transferring my credit, and now I am short $528 + $10 activation fee for a line I never wanted. There is zero help from Xfinity, they barely speak English and I literally know more about their policies than their own employees. I want my $700 credit or my “old” iPhone 12 back!