What a terribly annoying company keeps calling. Ve...

What a terribly annoying company keeps calling. Very often pushed away at first. Accidentally recorded once and indicate that they are not interested. Then they turn the conversation like this by closing with, 'think about it after we call and be back soon' ...
Fine they have been with me for 2 months now. Their score: 11 missed calls and 1 answered call with no interest.
I have blocked all 033-75489xx numbers of their (100st), see how long they continue without bothering me (can see how many times a blocked number called) :)