Withholding information

The service department officials do not provide customers with the necessary information relating to the terms and conditions of the service plan / warranty ... All the others services you are allowed to bring in the car a month before or after the date you first registered your car. This principle however does not apply to the last service , this became apparent when my car could not be services due to the fact that it had expired. Only then did I discover that I was supposed to bring it before the 24th of August . The service book does stipulate this information and the officials conveniently refrain from filling out the 'next service due' on our service d books after the service is completed . I now have to pay for a service the cause I was 7 days late according to system yet in the 3 years I've taken car in September it was never mentioned . As much as it's the customers responsibility to take the car to service the officials must also be responsible for informing customers relevant information