OMG that sounds so scary, did they know who you were?... Were you scared?... Do you carry around a shank or pepper spray?... Do you think that they were going to try to hurt you?...
I would have driven away, even if I thought he was employee or valet guy... Im paranoid as fuck... The other day someone left a message on my answering machine he said "oh come on, then he began to sing, "Im a girl watcher, Im a girl watcher". And hung up. I started calling everyone thinking maybe one of my friends prank called. So I called the number and it was Mervyns debt collectors. I dont owe them money so I dunno why they called. I guess he didnt realize he was recording. Even then, if it was a CREEPY STALKER, he could have just forwarded my call... 
Hopefully it was one of my friends fucking around...
Be careful Gia...
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"Nature already created the perfect dishwasher....its called a woman." - Fiend