We are talking about KLM here, the airline who have the ability to do anything should you accept the mission.
I have had this happen a number of time over the years out of Manchester when we check in a lot of luggage for exhibitions.
The best you can hope for is to qrite to the UK office which is now at Heathrow and hpe someone with half a brain picks up your letter. Chances are now you have posted on here you are seeking miles they will have you on the black list for complaining.