Global Travel Pass Nightmare

I need help figuring out how to get this issue resolved.

In August 2022 I traveled abroad. Prior to leaving, I called customer support and had Global Travel Pass activated on two lines on my account. At the border, one of the lines got a message stating that GTP was active, the other did not. I immediately called customer support, the agent assured me that GTP was active on both lines and that everything was fine. Several days into my vacation abroad, I got a notice from Comcast/Xfinity letting me know that I was amassing a rather large bill from international roaming charges. I called customer support again, after a few hours on the phone I was told the charges would be reversed and that GTP was now added to my account. Several days later, I saw that my charges had almost doubled. We spent several hours on the phone over multiple calls trying to get this resolved. Ultimately, no one was able to turn GTP on and after returning how customer service credited my account for all the roaming charges.

Now, in April 2023, I again traveled abroad. I again called customer support to have GTP added to my account. Again I was told it was added to my account. I could see on the Xfinity Mobile app, it was not added to my account. I was unable to add it myself as there is an error when I try to do so and it instructs me to call customer support or chat with customer support. I did so through my travel abroad multiple times. At this point, I've contacted customer support somewhere between 15-20 times. Thankfully, I knew better and disabled roaming while crossing the border so I avoided the charges, however I was left without access to my data and was unable to keep myself safe during my travel.

I'm trying to find out who to contact at this point to get it resolved. Here's what happens when you contact customer support...
1) I get to explain this over and over to a new customer service agent.
2) I'm assured that my concern will be taken care of. I'm assured that I'm certainly speaking to the right person who will make sure my issue is resolved.
3) I wait for around 10–20 minutes while they try to again add GTP to my account.
4) I'm told that my GTP is pending and that it's "stuck" in the system. They often ask for more time while they use "advanced tools" to solve my issue.
5) After 5-10 more minutes, I'm told that they have successfully fixed the problem, but I need to wait some amount of time (it ranges depending on the agent from a few minutes, 30-60 minutes, 8 hours, 24 hours or 36 hours).
6) I'm assured that GTP is on my account and that there will not be any need to contact customer service in the future.
7) After waiting the specified amount of time, nothing happens.

8) Contact customer service, start over at #1

I've asked to be escalated to a different department, I've asked to speak with tier 2 level support, I've asked if there was a support team that handled more complicated issues. The agents typically say either they're already working with tier 2 level support or there is no need to contact anyone else because they definitely solved the problem and I can "rest assured" that they have definitely added GTP to my account this time. I don't know what to do at this point. It's ruined two trips abroad and has endangered my family. I don't know how to get this resolved or who to contact at this point. Please advise me on how to get the help I need.

Thank you for your time.