Where did dedicated.abac.net. come from in my rDNS and PTR records?
To set the PTR record for your IP address, you also need to have the DNS server for that range delegated to your nameserver.
Currently, abac.net hold the ownership of your IP address, so you will need to contact them to ask them to configure the nameserver for your IP address to point to your nameserver, or, ask them to change the PTR record to 64-150-172-81.example.com. Most providers will do one of these for their business customers.