How can I get charged fee reversed on boosting device? No warning of fee

Is there a direct line a customer can call about this. This is horrible and nothing I would expect for a diamond member

Thank you for reaching out with this billing concern, @user_a8d141. Our team would gladly take a closer look at things and help escalate this on your behalf. Could you please send our team a direct message to continue?

How to send us a direct message: 

1. Click "Sign In" if necessary. 
2. Click the "Direct Messaging" icon. 
3. Click the "Start new conversation" (pencil and paper) icon. 
4. In the "To:" line, type "Xfinity Support". 
5. As you type, a drop-down list will appear. Select "Xfinity Support" from that list. 
6. An "Xfinity Support" graphic will replace the "To:" line. 
7. Type your message in the text area near the bottom of the window. 
8. Press Enter to send it. 

To expedite your request, we ask that you please include your name and the service address alongside a detailed summary of your request/question. Thank you!