Here’s how I’d answer it: “No. And do not contact me further.”

Odds are that they will insist. If they do, the answer is longer:

*“You seem to have a really hard time understanding simple words, such as «no». So let me rephrase what I said, in a way that hopefully even you will understand:

I DO NOT WANT TO TOUCH YOUR BLOODY COMPANY, LED BY A LITERAL NAZI, WITH A THREE METERS POLE. NO MEANS NO. SOD OFF YOU BLOODY MUPPET, THIS IS NOT UP TO DEBATE, STOP BUGGING ME WITH THIS SHITE.”*

then block it.