Billing Issue/Conflicting answers from customer service

Hello,

I’m hoping someone can clarify what seems to be a billing error or misunderstanding.

On October 12, I changed my internet plan from 800 Mbps ($105.66/month) to 500 Mbps ($56.20/month). The downgrade happened before the new billing cycle, which runs from October 15 to November 14.

I had already paid for the 800 Mbps service for the previous cycle (Sept 15–Oct 14), and that’s fine. However, my upcoming bill is still showing $105.66, even though I’ve been on the 500 Mbps plan since October 12 — before the new billing cycle even started.

Customer service agents have told me this is because of when the plan was changed, but that explanation doesn't make sense to me. Why would I be charged the full price for 800 Mbps from 10/15 to 11/14 when I’ve already been on the 500 Mbps plan before that period even began?

I’ve reached out multiple times and received conflicting answers — some say the bill will update, others say I have to pay the full $105.66 anyway.

Can someone from Xfinity confirm:

1. Whether my plan change was properly timed to take effect for the 10/15–11/14 billing cycle?

2. Why I'm still being billed at the old rate?

3. Whether this amount will actually be updated before my due date?

4. What will I need to pay on Nov 6?

Thanks in advance for any help or clarification.