Charged for repair I already paid for

I recently received an owner's statement from my property mgmt co. that had an $83 charge for replacing a toilet sloan valve.  First of all... they're supposed to notify me before any repairs are done - they didn't.  Secondly, they're supposed to give me the option of using my handymen or theirs - which I never got to make that choice.  I recently had a list of repairs completed along with a remodel before the tenant moved in last month.  Replacing that sloan valve was on that list.  I am out of state and a rep. from the property mgmt co. checked and approved that all of the work had been done.    If they'd notified me before, I could have just called my guys back out to do the work they apparently didn't do.  Now, I'm stuck with a charge from their handyman for a repair I already paid for and a promise that it won't happen again.  Any advice?