Existing Customer Pricing vs. New Customer 5-Year Price Lock Deals — Promotion Ending October 22

My current internet promotion expires on October 22, and I’m reaching out to see what options are available to renew my existing plan.

I’m currently paying $95 per month for 1.2 Gbps download speed. My current plan is set to increase to $130 per month when my $25 promotional discount expires. When I look at the offers available to existing customers, I’m being offered:

1 Gig: $100/month

2 Gig: $130/month

However, the offers advertised to new customers are significantly better:

1 Gig: $70/month with a 5-year price lock.

2 Gig: $100/month with a 5-year price lock.

That means a new customer can get 1 Gig for $30 less per month than the existing-customer offer, or 2 Gig for $30 less per month than what I’m being offered. Over five years, that’s a $1,800 difference at either tier, assuming the advertised monthly prices remain the same.

Meanwhile, I’m being asked to either pay more for a lower speed or pay $130 per month to get 2 Gig. My current 1.2 Gbps service is already performing well, and I’d prefer to stay with Xfinity rather than switch providers. I would appreciate having my account reviewed for loyalty offers or promotional pricing that would allow me to keep my current speed at a competitive rate.

Given the significant difference between existing-customer and new-customer pricing, could someone please explain why these offers differ so substantially and whether my account can qualify for comparable pricing?

I’d prefer to remain a customer, but I would also like to understand the drastic difference between the new customer and existing customer deals. 
Thank you.