Comcast Service Cancellation Issue: A Clear Summary

After maintaining two separate Comcast accounts since 2020—one business and one residential—I've experienced dramatic price increases without explanation:

• Business Internet: $100 → $250 → $500+ (as of November)
• Home Internet/TV: $150 → $250 → $500
• Monthly total: $350 → $1,000+

Despite multiple cancellation attempts for my business account (which I no longer need), Comcast has created significant obstacles:

1. I've sent multiple emails
2. Made numerous phone calls
3. Recently spoke with an unhelpful representative

The current situation:

• Comcast disconnected my service on February 1st
• They continue charging me ($1,000+ for February and March)
• When I called to cancel, I was told I must:
  • Pay my entire balance first
  • Sign a DocuSign form
  • Return equipment to UPS

Most concerning issues:

• I'm being charged for disconnected services
• The representative claimed I'm paying for "service being sent to the location" that I "couldn't use"
• I cannot cancel without first paying disputed charges
• Charges continue to accumulate during the dispute

As someone who has led teams emphasizing customer-centric service, I find this approach deeply troubling—especially after paying Comcast approximately $40,000 over the past few years.

My question: Is this practice of requiring full payment before allowing cancellation (while continuing to charge for disconnected service) legitimate, or do I have options to address what feels like extortion?