Hello Orkun,
i can confirm that this is an actual issue.
We've got an /22 block from RIPE and every single IP-Address from this block is on the symantec bad rep list for no apparent reason.
The provided ipremoval service, does not allow the request of entire blocks and i feel like spamming it with 1024 requests would just make things worse.
Did you resolve this issue? / Have you found a contact that has helped you out with this, that you would be willing to share with me?