Unable to call from overseas: Active mobile line billing issue

Hello, I am currently outside the United States and cannot contact customer support by phone. I previously cancelled my services, but my online account shows that my mobile data line is still active and charging me, even though it hasn't been used since July 15th.Because I am overseas, I need an official employee to help me drop this line and resolve the billing error. Could an official representative please reply here and invite me to a private Direct Message so I can safely share my account numbers and details?
Thank you.