Higher estimated bill after changing from 500 to 300

Hello Xfinity Support,

I recently requested a change from 500 Mbps to 300 Mbps to reduce my monthly expenses. However, my next bill estimate increased from my previous monthly total of $86.05 to $167.71, including $155 in regular monthly charges.

Could you please review this and help me understand the difference? My goal is simply to have 300 Mbps internet service at a lower monthly cost while keeping my existing community-provided benefits.

I would appreciate your guidance on the available options and confirmation of my ongoing monthly total, including taxes and fees.

Please let me know how to provide any account information privately.

Thank you for your time and assistance. I look forward to your response.