OH darrin. That sucks. Even if the company doesn't cover the bill, the other attendants obviously saw it happen and if he's an employee, they will have all his details. Ask for his name and his rego and car make/model (I'm gathering they would have to have some record of his rego for parking purposes and fees/fines for the place).
Can you obtain peoples licence number from Transport in this type of circumstance? I was lucky when the magna ran into me, I wasn't going to let him go anywhere until I have every single detail, which was lucky cause when I sent him the quote, he replied telling me I was half at fault and therefor I should absorb half the cost. I didn't reply to him, I just phoned my insurance company and they dealt with him. That was in May/June/July last year and I haven't heard anything so I gather he coughed up to the insurance company (probably twice as much as it would have cost for the simple quote I got). I didn't have to pay to claim cause I had ALL his details, registration, car make/model, licence, name.. when he last went to the toilet. I couldn't be bothered arguing with a moron, so I just sent it to my insurance company.
I hope you can get his details and have him pay for it. That's why I don't like leaving my car anywhere like carparks, cause of ignorant people like that guy. Honesty gets you a long way.