Help with free line mobile bill

I flew out of the US on Nov 29, 2025 for a few months.

So, I had to cancel my wifi plan and also the mobile free line that came with the wifi plan on the very same day. That was my secondary phone line and did not make sense to keep that line while I was abroad. I did the cancellation in Xfinity office in Sunnyvale.

Now I see a bill of $38.45 on my mobile line which was free along with the wifi plan.

.Could you please help me here as I am getting charged for a service I did not use and the free mobile line was cancelled on the very same day as the wifi plan. I can pay the monthly $2.42 which I paid in previous mobile bill statements but $38.45 seems excessive.