Static IP block gateway offline, 4+ Days, Tier 3 Escalation Ignored

We've been a Comcast Business customer for over 2 years with a static IP block that worked daily without issues. Despite multiple calls, a technician visit, and promises of escalation, the issue remains completely unresolved and we are getting conflicting information at every level of support. We're using a Peplink B One router and a Comcast business modem, and had a working IP block that we used daily for years prior with the same setup. Same router, modem setup, everything. 

On our end we tried everything possible, we configured Peplink WAN with exact settings from Comcast's activation email (Static IP 96.xx.xx.1, gateway 96.xx.xx.254, /24 mask, Comcast DNS), we've reset both modem and router multiple times, tried both WAN ports on the Peplink, attempted MAC address reservation, disabled health check to isolate routing vs. DNS issues, confirmed no DHCP fallback on the router, and Verified packets are correctly leaving our router from 96.xx.xx.1, but evey time the ping test gives 100% packet loss. Here's the exact output from the test on our router:

PING 96.xx.xx.254 (96.xx.xx.254) from 96.xx.xx.1 5 packets transmitted, 0 received, 100% packet loss

Our router is correctly configured and sending packets. Comcast's own gateway IP is not responding, we even tried a new router to confirm this. The first time we called comcast (on Friday the 3rd), they said our block was activated but the issue persisted with no change after the call. A Comcast representative confirmed the gateway was offline and the block was "not fully online." When we pushed back and asked for escalation, a different rep insisted the problem was on our end, gave us attitude (hung up on us), and refused to escalate despite us presenting clear evidence to the contrary. We called again on monday and they sent a tech out the following day. Today (Tuesday) the tech confirmed the modem was active and fine but acknowledged the IP block was not routing correctly. Rather than resolving it, he issued us a completely new IP block and said he would escalate to Tier 3. It's been 4 days now without a functioning static IP and it's affecting our business operations. 2 seperate blocks have now failed to route, one rep confirmed the gateway was offline on their end, then the next rep blamed us. We're looking for a Tier 3 network engineer to confirm the current block (and the new replacement block) is fully provisioned at the CMTS level rather than just activated on the account and an explanation for why two seperate blocks have failed to route, as well as accountability for 4+ days of downtime, we asked for a discount or refund to which the rep nervously replied "uhh, i don't think i can do that, let me see.." then hung up on us mid call. The tech left without resolving the issue and handed us a basic front-line support number rather than any direct Tier 3 contact.

We are asking for:

1. A Tier 3 network engineer to verify the block is provisioned at the CMTS level

2. An explanation for why two separate blocks have failed to route

3. A direct ticket number and callback for the escalation the tech promised