Call to cancel service but it did not go through

Dear Cox,

I called your representative on Feb 14 to cancel my internet service because I will be staying in Europe from March to August 2020. The representative I talked to told me he had cancelled my service. However, I received a bill today (March 20) which clearly indicates that the service was not successfully cancelled. Legally speaking, I should not pay for the service which I did not choose to use. And I felt being cheated. I hope someone can help me to resolve this issue. Since I am currently in Germany. You can reach me through the email: lexlu66@gmail.com. Thanks.