Proofpoint - IP is blocked

Anyone else having issues with emails being rejected by proofpoint? I have tried multiple times requesting for my IP address to be unblocked with no success (not even a response from Proofpoint!). My IP address does not appear on any well known spam blacklist, I’ve configured DKIM, SPF and DMARC…

Has anyone had any sucesss with getting their IP unblocked from proofpoint?