in my experience with Mazda Glenmarie their booking times also must make 1 month in advance for servicing

hmm i never experience overmileage as my parents mazda has always been under mileage for the related service so we service based on time rather than KM driven. But I remember once my parents forget to service 1 time la and late a few months, then they skip that supposed service and went to the next one which i think is what you are referring to