Assuming that the two painters are working to a fixed priced contract - the first question is
a) are they self employed and in partnership or are they employees for a company.
If the latter applies then we should inform their employer directly - as they would be surely interested to know that they only work a couple of hours a day and provide more supervision/instruction. Or maybe just sack them !
If they are self employed then its a case of contract management. The countract should include
a) payment milestones. They are only paid when defined chunks of work is completed.
b) quality criteria. The work is subject to inspection and confirmation of quality before payment. We need to make sure AEA do a thorough inspection and that AEA ensure that the quality of painting is sound. This is where I would worry as the employees of AEA do not have a vested interest is seeing that the work is up to standard. We residents do! So I would propose that EVERY inspection event is attended by members of the resident/owners management committee who have an equal say about the standard and quality.
If the contract is deficient then AEA are responsible for poor administration but I would be surprised about that given the sites that they manage and the number of years they have been around.
So its all about us managing AEA to manage the painters (or the painters employees).
Sorry that I am not there to help. I only generally go to DV in winter when the noisey renting tourists are gone (admittedly not all renting tourist are bad but just one loud lot are enough to ruin my stay).