can't unsubscribe policy in nbu web appliance 3.1.2 from web

 can't unsubscribe policy in nbu web appliance 3.1.2. some vmware virtual machines have a policy in web appliance.I need to cancel thoes policies. So, I click unsubscribe the policy in the web appliance.but it doesn't have any effect.

question:

how to stop this  job?

Is there any command to unsubscribe this policy by using admin user？