Viking Cruises review: Company will not stop bombarding me with brochures

I took one Viking cruise in 2022. It was okay but was not my cup of tea. There is very little to do onboard except look at scenary. I understand this is why people cruise but there are no other options for those who need a break from this. We also experienced an incident in Germany where one of the tour guides clearly was a Nazi enthusiast. This was unsettling for our group but especially for my family as our grandmother survived 3.5 years in a concentration camp.
I have asked this company for THREE years now to STOP sending me brochures but they will not leave me alone. I have called over and over to no avail. I am not interested in their brand and just want them to leave me alone. Is this company that desperate for customers that they need to constantly harrass previous customers? How do I make them stop bothering me?
I got 5 brochures last week. If you cruise with them, they will apparently bother you for the rest of your life.