Air conditioner flaps in dashboard

[JDVKTM]

I booked my 2006 T5 in fr a 160 000 km service and the garage just called me to say the air conditioner flap in the dashboard has to be replaced as it has seized or will seize shortly...
Cost: GBP 116 for the part and 195 for labour !:?

Is this a normal problem an seeing that the labour is so high , should I not replace both ? (left and Right)

Any information will be appreciated
Regards for Cape Town
Johan