Mack, what you would like to hear and what the situation actually is, are not necessarily the same thing. Dr. Guzman answered your question quite clearly. You seem to have brushed over (disregarded?) Dr. Guzman's answer in lieu of what you want to hear.
The short answer, as given to you by Dr. Guzman, is: it depends on the contract. No one here, not even DR1's expert Dr. Guzman, will give you the correct answer to your question without first having read the contract entered between you and the management company.
You say that the contract states:
In the event that the Management company's employee performs maintenance on the property the owner agrees to pay the bill.
If the contract state word for word the above, there is room for all sorts of disputes! The above statement clearly establishes that IF a person employed by the management company preforms any maintenance on YOUR property you are responsible for any and all expenses generated. However, the above statement does not address the issue of persons hire by the management company on your behalf to work on your property. Again, it all depends on the way the contract is worded.
If you do not agree with the interpretation of the contract by the management company and you think that the management company has breached the terms and conditions of the contract, have your lawyer seek legal remedy. The point of whether or not certain employees are yours is an issue you need to settle with the management company based on the terms and condition of the contact. The contract may give the management company some very broad rights one of which could be the ability to hired people on your behalf.
NotLurking