Try this https://seventrumpet.com/2012-2017-seat-leon-mk3-service-oil-light-reset/
Carista/OBDEleven/VCDS can be used too.
The method linked should reset it manually.
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I don't think 0.0/SET is available on mine with a digital dash?
thought mine was being silly saying 29 days to service and not a year old until July! 400 miles is a joke!
think there's a bit of confusion, I've had my car since July, was just saying about the OP, 400 miles is silly for a service warning, you'd think the dealer would reset everything when registered?
I never get service intervals, I only do about 3k miles a year as we use the missus's car for local errands etc.. but it's still expected to have a service every year then you get some cars that do high mileage and they can go 2 years between services? barmy!

thought mine was being silly saying 29 days to service and not a year old until July! 400 miles is a joke!
I don't think 0.0/SET is available on mine with a digital dash?