[anti-abuse-wg] Recommendations for ISPs

Are there detailed instructions for datacenters about how they should be 
creating abuse-c records?

I've been in contact with a datacenter that has one generic abuse-c 
contact for their organization, but then each individual network has 
some remarks saying 'please contact this email address instead'.  If you 
email their general abuse email, they tell you to check WHOIS and email 
the address in the comments.

This completely breaks the RIPE abuse contact finder, as well as my 
scripts to automatically send abuse emails.  They don't seem to see the 
problem with this, so I was hoping for some decent documentation I could 
show them about it.

How should this generally be handled for network providers with lots of 
reassigned subnets?  Am I right in believing this pretty much defeats 
the purpose of the abuse-c record?