Got charged twice after cancellation

I already moved out of the US and no longer using my US phone number. I canceled the service and my number in mid April. However, I got charged on the beginning of May and June for recurring payments. When I reached out in May, I can’t even have a human agent answering me because it says my account is deactivated. If my account is deactivated, why still charge me then? I got charged again in June. So what is the fastest way to disconnect me from xfinity completely and DON’T charge me ANYMORE because I am no longer using your service.