Took my '06 E3504matic into dealership for 39k service on transmission and 4matic. They flushed the transimission fluid and didn't change the filter. Is this consistant with the factory requirements?

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MBlovr
'59 180 Dad's original
'59 180 Dad's 2nd one
'67 250SE Dad's last one
'59 220 SE My first one
'62 220SE Coupe second one
'89 190E 2.6 5spd third one
'06 E350 4matic (sold)
'10 E350 4matic