Are you paying directly?
If so I'd probably look for a different agency.
We had two agencies and then hired privately for my mother-in-law.
One was good staff but timing unreliable.
One had much less experienced staff but timing was good (!)
The third was excellent (staff
chosen by us) - but it was super important - as they were living-in.
I'd say try another agency if they don't improve after speaking to the manager.
I too would expect all of them to be able to use our loo. 
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