JonH – Does your concierge keep a Log of: which Lots in the building needed assistance; at what times the assistance was needed; and what type of assistance was required by that particular Lot? Does your concierge keep a Log of ‘incidents’ that occur at your building?
Having substantiated evidence that you can rely on, such as a Log, may help you work through your problems.
Another suggestion: Are you able to take a look at the concierge’s contract to ensure that the concierge is not being asked, by a select number of Lot owners, to undertake functions that are not part of the contract?