There is a phone number on the notice, the police said you could call to ask if there are any overdue fees, or it might be possible to refund the overdue fees, have you contacted them ? Netherlands Q&A
When picking up the car, be sure to check on the spot whether there are scratches on the car, whether the tools and documents are complete, and whether the lights are OK, etc. If there are defects, be sure to ask the staff to issue a pickup and inspection form and note the details, and keep this form. When returning the car, also be sure to ask the staff to issue a return and inspection form to indicate that the car is in good condition. Keep these two forms well for a long time as evidence to refute deductions. Also be sure to abide by traffic rules, otherwise you will receive traffic deduction information after returning home. Wishing everyone a smooth journey ? Switzerland Q&A