How do I check to see if a credit I was promised over the phone is actually planned for my next bill

user_270nqu, thanks so much for reaching out to us through Xfinity Forums. You should get a notification either through the Xfinity app or via email letting you know that a credit was applied. If you would like us to take a look at your account, 

send us a DM with your name and address.

Here are the detailed steps to direct message us:

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.

https://forums.xfinity.com/conversations/guidelines/how-to-direct-messaging-within-the-forum/697ba1e570934d009185c514