One of our sites has everything running except for the Silverpeak device

The site went down due to non payment of bill from Spectrum.

After the bill was paid all the following devices except for the SDWAN Silverpeak (NX-5500 & NX-3500 device has come up.

1. Meraki MR42 Cloud Managed AP
2. Meraki MS120-24P Cloud Managed PoE Switch
3. One PDU
4. One Opengear

What could be the reason for the Silverpeak device to be still down? The ISP modem connected to the wan port of the silverpeak device could be down. But if that's the case, all the devices should have gone down.