XM-Only fee charged despite active Xfinity Internet at same address - refund request

Hi - I'd like help with a billing issue on my Xfinity Mobile account. I had Xfinity Internet and Xfinity Mobile at the same service address. My first mobile statement (Sep 2025) showed a '1 year Unlimited line discount.' Starting with the next statement (Oct 2025), the discount disappeared and a $25/month 'XM-Only fee' appeared instead, even though my internet service was active the whole time. The fee ran through Mar 2026 (about $168 total) and then stopped. It looks like my internet and mobile accounts weren't linked until ~Apr 2026, so the fee should never have applied. I've since cancelled the mobile line, but I'd like a refund or credit for the months the XM-Only fee was charged. Can a Comcast employee please review? Happy to provide account details via Direct Message.