Repeated "Lmtd Basic Converter" charge in my bill even though I don't really have any "Lmtd basic converter"

Every now and then Xfinity will add a random "Lmtd basic converter" to my account and charge ~$9 per month until I noticed and complained via customer support.

It's happening to me again.  

I've reported this a few times.  Every time an agent would try to remove it + refund and promise me that it won't happen again.  

But then a few months later, this mysterious charge will show up in my account again.

From searching the forum, it seems like I'm not the only one who repeatedly have this problem. 

It's almost like the company is trying to find a way to charge customers extras if they don't check the bill / if they don't spend time contacting customer support.

If this continues maybe the company deserves a class-action suite for this dishonorable policy.