I need support with a data roaming charge I cannot afford

I was recently traveling through Europe and signed up for the Global Travel Pass. Because I was traveling in Europe, I had the majority of my "mobile background refresh" and "mobile data" settings turned off on my phone. During my road trip (which I was driving and not looking at my phone) at 9:52 AM - we crossed into Andorra which was not covered in the Global Travel Pass. 

When I pulled up to the hotel at 10:21 AM I checked my phone to see a text message notification from Xfinity alerting me about the lack of coverage and I immediately put my phone into airplane mode. In the 30 minutes of crossing into the country to when I pulled up to the hotel - I apparently incurred $431 of data charges from 4 hits of mobile data from whatever apps were not turned off. There were NO messages from Xfinity alerting me to this - I only was made aware when I checked my email after I was able to get on WiFi. 

The data points are listed below. Based on the time frame  - it is clear that I did my diligence to the best of my ability to avoid this situation. It's also clear that I was not intentionally using my data, otherwise there would be additional charges from Andorra during the 3 day period in which I was there. 

I CANNOT afford these data charges. I spent over two hours on Chat yesterday and they told me there was nothing that they can do except offer me a new Apple Watch??? I am unclear how to proceed at this point.  I am considering cancelling my service with Xfinity because the lack of customer service is frustrating and I feel like I am getting taken advantage of. 

• Andorra, 10:21:18 AM PDT 16.29 MB

• Andorra, 10:04:27 AM PDT 2.23 MB

• Andorra, 10:02:37 AM PDT 1.46 MB

• Andorra, 9:52:00 AM PDT 2.1 MB