Abusing voice mail. Probably, but some things will happen no matter what the policy is. Yes, the problem is one employee putting in time vice being productive. An employee sitting at their desk for 80 hours is meeting the requirements of the work week, but without production, the public is not being served. Get rid of the dead wood.
Abuse is somewhat of a problem.
Yes, but only a very small number. I even feel guilty to take annual leave to the point I will lose leave. Don't believe this is right. Don't know about others. Basic solution is simple.