Xfinity keeps charging me even after I canceled my plan two months ago and won't refund

I canceled my Xfinity plan (Wi-Fi + mobile) at the beginning of September, because I moved out of the US for a while. That’s why I was very surprised to discover that I was still billed for my plan at the end of the month as usual.

I got into a very long conversation with Xfinity’s chat support, where they said that they would send me a refund check by mail to my previous address. After even more time, I managed to explain that I’m not in the US at the moment, so they agreed to start a refund process through bank transfer instead. A few days later, I received an email from Xfinity’s refund service and submitted all the required details. However, I never received any refund.

I thought that was the worst that could happen, but then I got another email a month later saying I had been billed again! Exasperated, I tried to contact Xfinity via chat, only to find that I’m no longer allowed to use the chat option because I don’t have an active account anymore (which is funny, as I keep paying for it), and that I can only contact them by phone.

At this point, I’m stuck. I can't find any email address for Xfinity anywhere online, and since I’m abroad, I can't have long phone calls with customer service, as it will cost me a fortune. Does anyone here know how I can reach them by email?

I am exhausted by this whole ordeal, and honestly, I am at a point where I will recommend anyone I know to stay as far away as they can from Xfinity's services.