I have been unable to obtain satisfaction in more than 12 hours of phone calls and 2 trips through level 2 support

I have been an Xfiinty customer since the 1980s and have 2 houses internet and phone and 4 phones and 4 watch lines and all kinds of business with your company but I am ready to leave if we don't resolve this one.  I was persuded by an Xfinity sales representative last year to bring our phones over from T-Mobile. The deal was financially advantageous and would get 1 free iPHone 17 for one of us and  I thought it a good idea to consolidate bills to just one company for all this stuff.  I probed carefully whether if one of our phones needs to be half time in the United States and half time in Israel, we could activate dual e-sim on that phone so she can receive calls from friends while there without international calling (I know she has unlimited call and text for her OUTgoing). We were assured the answer was "yes" both during the sales cycle and in activation.  She activated and left for Israel only top be told dual sim could not be turned on until she had been an Xfinity customer for 3 months so she used an Israeli phone and her iphone there for 3 months and then we tried again. This time we were told it could not be done because the phone is not paid off. I offered to pay it off buot that would void the discounts on the iphone 17 which are given to us to pay month by month. I am told it is "impossible".   I assume it has to do with thinking we'd run off with the phone globally and it's not paid off? I have an 800 credit rating and am a longtime customer. I'd be happy to pay it off now at the promised discounted price to solve this. But not at full price. I need someone to get logical and solve this. She needs to have a US sim and be able to active an Israeli Sim when in Israel.  Thank you for your attention to this matter. NOTE: This was one of 6 issues I've had to slog through with your awful customer service. FIrst another account member was made primary on my account (Now fixed). I'm still unable to view the mobile bill attached to my PHilly home online or in your app. Our service didn't work in Puerto RIlco on vacation last month til I spent an hour on the phone from there. THere is an extra iphone I"m trying to return to you and no one could cut a return label but I"m honest so I"m not keeping the $1000+ phone but will fed-ex it back to the address it came from and hope it gets to where it belongs.  HELP!  

She is in the STates this month then returning to Israel.  I would move  her to another carrier but would have to pay off the phone at full price.