If it happens to you that you need to go from Paris-Charles de Gaulle to the center of Paris and public transport (RER) is closed due to strikes or maintenance workings you may opt to take the Les cars Air France bus system.
But be warned the bus drivers are not entitled to sell you return tickets, only single tickets.
The one way ticket is about 12 EUR. Return was about 18 (but is not sold when you board the bus, and the ticket office may be closed (strike).
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At Least Do This: Contact Les cars Air France explain and complain about the situation and you may get courtesy tickets for your next trip to Paris.
There is no point in complaining to the bus driver.
If you cannot avoid taking this bus, then get off at Gare de Lyon.
Going by bus from Gare de Lyon to Montparnasse may take ages.
Alternative: Find some other stranded tourists and share a cab or rent a car.
Avoid going to Paris Charles de Gaulle if RER is offline.