Re: Receiving threatening phone calls at work.
So, you received TWO phone calls
one day after another
from two different people?
That means that the first phone call was discussed between the two people and it was discovered that you are susceptible to fear enough that a second phone call would satisfy their thirst for causing fear in other people.
Notify your past employer that they have a scheming employee that is conspiring with an irate client in order to cover up their own incompetence and/or corruption. It is in that employer's best interest to get to the bottom of this.
Notify the parking lot security and try to make arrangements to be parked directly in the view of the security camera. If they didn't do anything before while you were at your previous employment, why would they actually get up off their butts now and do anything more than a phone call (maybe they were being careful that the boss wouldn't find out??).
Your current manager is probably hidden behind half a dozen receptionists and voice mails, and when he is in the office, he probably only listens to voicemails deciding which calls he will return.
The reason the caller told you that they are going to call your boss is that they wanted to instill FEAR in you (but they run the risk of SLANDER and being discovered by your old boss,..their lack of enthusiasm??). If they are exposed, you might be able to file for a restraining order against them for stalking. That would go on their employment record and make them less employable/lose promotions these days (you are not defenseless,...not by a longshot). They just want to play their game, but YOU could cause them alot of damage.
If they really were anxious to do anything (instead of simply cause fear), they probably would have already done it (especially if they know your car,...vandalism).
Don't let them rule you with fear, by messing with you, they got themselves into a big mess (your previous boss really would like to know about them).
The Police might contact your old boss and the callers might very quickly drop their game.