STOP CALLING ME!!! ITS RIDICULOUS!!!

I am getting constant calls from these people for 3 days, last week Thursday alone they attempted to contact me 9 times, another few times on the 13th, I then answered one of the calls and asked the gentleman to please make a note to take me off the system as I have not given permission for anyone to contact me and I am not interested. Well that clearly did not happen as today again they have attempted to contact me, I keep blocking the numbers but then after a few attempts they call from a different number.... Please STOP phoning me!!! I am not interested and this is becoming extremely annoying!!!