I keep asking Xfinity Mobile to remove my unattached watch and they keep assuring me they did, and it's still there

I ported away my line (left the rest of the family with XM).  This left my apple watch on the account (orphaned and unattached) and I continue to be billed for it.  I've contacted support twice and they assure me they've taken care of it, but it's still there.   Can I please get help?  I'm tired of wasting my time and when they ask me if I'm willing to come back, I have to wonder, why, when it's this hard to get something so simple figured out.   I've probably wasted over 3 hours on this, including waiting for call backs, and then being transferred, and then waiting on hold and finally giving up.