Disappointed by the guided tour (Saturday 11h)

Disappointed by the guided tour (Saturday 11h)
Tickets purchased in advance on the Internet for the guided tour of 11am but the doors of the museum rue de Conti open at 11am
We head straight for the museum. We are waiting for the start of the guided tour ... finally we are told that the guide has started ..... we come back for bad information ... in short, not to the point and we missed part of the visit then that we were there and that we were made to wait.
The staff who works the rooms and absent on Saturday ... Very pity
The guide is not French .... we are in France ... pity
In summary, a very nice museum to do in the week and independently ... because the museum itself is very well done in a beautiful setting
Disappointed to have chosen the tour and Saturday