Just Bad service all round

my complaint is a simple one, I bought a new nissan NP200 from produkta Nissan Nelspruit on the 12 December 2020, and now I'm being told that the car is due for its first service 15000 annual service, I explained to the staff at Produkta Nissan Nelspruit that my car has only just done over 13000 kms and I still have around another +-2000 km's to go before its service and it hasn't finished a year yet, they advised me that if I don't bring the car in for a service, its warranty will lapse...now my question is if its an annual service, the car must have at most a year (which it hasn't), or it must have done 15000 km (which it also hasn't) so how can a warranty lapse if both those conditions have not been met yet...it is not the first time that produkta nissan nelspruit has given me bad service, I previously had sent emails complaining about the car, to which I received no assistance and now this, I dont regret buying my Nissan NP200 (I love it) i just regret buying it from Produkta nissan nelspruit.